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{{Infobox Individual
{{Infobox Individual
|image         = Bill says goodbye to Heather.jpg
|image             = <gallery>
|species       = Human
Bill serves chips (TP).jpg|Human
|species2     = Cyberman (Mondas)
The Doctor Falls Bill Cyberman.jpg|CyberMondan
|species3     = Sentient oil
</gallery>
|origin        = [[Earth]]
|species           = Human
|affiliation   = St Luke's University
|species2         = CyberMondan
|affiliation2 = Twelfth Doctor
|species3         = Sentient oil
|affiliation3 = Nardole
|origin           = [[Earth]]
|job           = Dinner lady
|birth date       = c. [[1991]]
|job2         = Student
|death date        = After [[2017]]
|mother       = Bill Potts' mother
|affiliation       = St Luke's University
|foster mother = Moira (The Pilot)
|affiliation2     = Twelfth Doctor
|first        = The Pilot (TV story)
|affiliation3     = Nardole
|appearances   = [[Bill Potts - list of appearances|'''''see list''''']]
|job               = Dinner lady
|actor         = Pearl Mackie
|job2             = Student
|other actor   = Liam Carey
|mother           = Bill Potts's mother
|voice actor   = Nicholas Briggs
|foster mother     = Moira (The Pilot)
|clip         = The Doctor Meets Bill For The First Time - The Pilot - Doctor Who - BBC
|partner          = Heather (The Pilot)
|clip2         = Bill Enters The TARDIS For The First Time - The Pilot - Doctor Who Series 10 - BBC
|first cs          = Friend from the Future (TV story)
|bts           = Who Is New Companion Bill? - Doctor Who Series 10
|appearances       = {{appears}}
|bts2         = The Doctor & Bill's Relationship - Doctor Who Series 10
|actor             = Pearl Mackie
|bts3         = Bill faces the ultimate test - The Lie of the Land - Doctor Who Series 10 Episode 8 - BBC One
|other actor       = Liam Carey
|partner = Heather (The Pilot)}}{{you may|Bill Potts (Shadow World)|n1=the Shadow World version of Bill}}
|other voice actor = [[Nicholas Briggs]]
'''Bill Potts''' (born circa [[1991]]) was a [[companion]] of the [[Twelfth Doctor]].
|trailer          = The Best Of Bill Potts Doctor Who
|clip             = The Doctor Meets Bill For The First Time - The Pilot - Doctor Who - BBC
|clip2             = The Master Meets Missy World Enough and Time Doctor Who
|clip3            = Clara, Bill and Nardole Say Goodbye To The Twelfth Doctor Twice Upon A Time Doctor Who BBC
|clip4            = The Best Of Bill Potts Doctor Who
|bts               = Who Is New Companion Bill? - Doctor Who Series 10
|bts2             = The Doctor & Bill's Relationship - Doctor Who Series 10
|bts3             = Bill faces the ultimate test - The Lie of the Land - Doctor Who Series 10 Episode 8 - BBC One
}}{{you may|Bill Potts (Shadow World)|n1=the Shadow World version of Bill}}
{{counterparts |name=Bill Potts
|2=Bill Potts (Shadow World)
}}
'''Bill Potts''' was the final companion of the [[Twelfth Doctor]]. She shared a teacher-student relationship with him similar to that of [[Leela]] and [[Gabby Gonzalez]], albeit on more official circumstances.


When she first encountered the Doctor, Bill was working as a canteen assistant at [[St Luke's University]], seemingly destined for an unprivileged life. When free from work, she attended some of the Doctor's [[lecture]]s at the university. The Doctor saw her unfulfilled potential and invited her for a series of personal tutoring sessions.
When she first encountered the Doctor, Bill was working as a [[canteen assistant]] at [[St Luke's University]], seemingly destined for an unprivileged life. When free from work, she attended some of the Doctor's [[physics]] [[lecture]]s at the university. The Doctor saw her unfulfilled potential and invited her for a series of personal tutoring sessions.


Following an encounter with a [[sentient oil|time-travelling puddle]] that was piloted by her new crush [[Heather (The Pilot)|Heather]], Bill discovered who the Doctor really was — an alien time-traveller, guarding a secret vault beneath the university campus. The Doctor invited her to join him on a journey through space and time.
Following an encounter with a [[sentient oil|time-travelling puddle]] that was piloted by her new [[crush]], [[Heather (The Pilot)|Heather]], Bill discovered who the Doctor really was — an alien time-traveller, guarding [[The Vault (The Pilot)|a secret vault]] beneath the university campus. The Doctor later invited her to join him on a journey through space and time.


On her adventures with the Doctor and [[Nardole]], Bill travelled to a [[Gliese 581d|human colony planet]] and visited the last of the great [[frost fair]]s. She faced the [[vacuum|vacuum of space]] and saved the [[Earth]] using the memory of [[Bill Potts' mother|her mother]]. She also learned that the Doctor was trying to rehabilitate his old Time Lady friend Missy. ([[TV]]: ''[[The Eaters of Light (TV story)|The Eaters of Light]]'')
On her adventures with the Doctor and [[Nardole]], Bill travelled to a [[Planet (Smile)|human colony planet]] and visited the last of the great [[frost fair]]s. She faced the [[vacuum|vacuum of space]] and saved the [[Earth]] using the memory of [[Bill Potts's mother|her mother]]. She also learned that the Doctor was trying to rehabilitate his old [[Time Lord|Time Lady]] friend [[Missy]]. Bill also helped restore the Doctor's lost [[eyesight]] in exchange for temporarily helping [[Monk (species)|aliens]] take over the Earth.


When accompanying the Doctor on his test to see if Missy could be good, she was fatally shot on a [[Mondas]]ian [[Colony ship (World Enough and Time)|ship]] by [[Jorj]]. She was then converted into a [[Cyberman (Mondas)|Cyberman]] against her will. ([[TV]]: ''[[World Enough and Time (TV story)|World Enough and Time]]'')
When accompanying the Doctor on his test to see if Missy could be good, she was fatally shot on a [[Mondas]]ian [[Colony ship (World Enough and Time)|ship]] by [[Jorj]]. She was then converted into a [[Cyberman]] against her will, though she retained her sense of self thanks to her strong will.


Bill was saved from this fate by Heather, who converted her into [[sentient oil]] like herself, leaving with her to travel the universe. ([[TV]]: ''[[The Doctor Falls (TV story)|The Doctor Falls]]'')
After helping the Doctor destroy the Cybermen, Bill was rescued from her fate by Heather, who had returned for her and converted Bill into a sentient oil being like herself. After setting the TARDIS to take the Doctor away, Bill left with Heather to explore the universe.


== Biography ==
== Biography ==
=== Before the Doctor ===
=== Early life ===
Bill was born around [[1991]]. ([[TV]]: ''[[The Pyramid at the End of the World (TV story)|The Pyramid at the End of the World]]'') [[Bill Potts' mother|Her mother]] died when she was young, so she was brought up by a foster mother called [[Moira (The Pilot)|Moira]]. ([[TV]]: ''[[The Pilot (TV story)|The Pilot]]'') Bill did not openly express her [[Lesbian|sexuality]], preferring to only reveal it when required. Her adoptive mother was oblivious to her being a lesbian, assuming that Bill was interested in men. ([[TV]]: ''[[The Pilot (TV story)|The Pilot]]'', ''[[Extremis (TV story)|Extremis]]'')
Bill was born around [[1991]]. ([[TV]]: {{cs|The Pyramid at the End of the World (TV story)}}) [[Bill Potts's mother|Her mother]] died when she was young, so she was brought up by a [[foster mother]] called [[Moira (The Pilot)|Moira]]. ([[TV]]: {{cs|The Pilot (TV story)}}) Bill did not openly express her [[Lesbian|sexuality]], preferring to only reveal it when required. Her adoptive mother was oblivious to her being a lesbian, assuming that Bill was interested in men. ([[TV]]: {{cs|The Pilot (TV story)}}, {{cs|Extremis (TV story)}}) As Moira was never able to hold down a single partner, Bill tended to never bother learning their names as "[she'd] only get attached." ([[TV]]: {{cs|The Pilot (TV story)}})


=== At St Luke's University ===
=== At St Luke's University ===
Later in life, Bill served [[chips]] at [[St Luke's University]] in [[Bristol]], and — despite not being a student — attended some of the Doctor's [[lecture]]s. Noticing her potential, he became her personal [[tutor]]. Bill also accidentally fattened up a girl she fancied by giving her extra chips; though she lost interest in the girl, Bill continued to give her extra chips as a gesture of kindness.
Later in life, Bill served [[chips]] at [[St Luke's University]] in [[Bristol]], and — despite not being a student — attended some of the [[Twelfth Doctor]]'s [[lecture]]s. Noticing her potential, he became her personal [[tutor]]. Bill also accidentally fattened up a girl she fancied by giving her extra chips; though she lost interest in the girl, Bill continued to give her extra chips as a gesture of kindness.


[[File:Bill looks at her mother's pictures.jpg|thumb|left|Bill cries while looking at [[Bill Potts' mother|her mother]]'s pictures. ([[TV]]: ''[[The Pilot (TV story)|The Pilot]]'')]]
[[File:Bill looks at her mother's pictures.jpg|thumb|left|Bill cries while looking at [[Bill Potts's mother|her mother]]'s pictures. ([[TV]]: {{cs|The Pilot (TV story)}})]]
During [[Christmas]] [[2016]], Bill mentioned to the Doctor that she was "supposed to look" like [[Bill Potts' mother|her mother]], but, as her mum rarely had any pictures taken, Bill didn't really know if she looked like her. When she went to [[Bill Potts' flat|the flat]] where she lived with her mother, Moira told her she had found a box with pictures of Bill's mum. On one of the photos, Bill could see the Doctor's reflection.
During [[Christmas]] [[2016]], Bill mentioned to the Doctor that she was "supposed to look" like [[Bill Potts's mother|her mother]], but, as her mum rarely had any [[Photograph|pictures]] taken, Bill didn't really know if she looked like her. When she went to [[Moira's flat|the flat]] where she lived with her mother, Moira told her she had found a box with pictures of Bill's mum. On one of the photos, Bill could see the Doctor's reflection.


Over the course of her tutoring in [[2017]], Bill developed a crush on another student, [[Heather (The Pilot)|Heather]], who showed her [[sentient oil|a puddle]] that cast a reversed reflection. Bill asked Heather not to leave without her. As a result, when Heather was taken over by the puddle, she followed Bill home, so as not to leave without her.
Over the course of her tutoring in [[2017]], Bill developed a [[crush]] on another student, [[Heather (The Pilot)|Heather]], who showed her [[sentient oil|a puddle]] that cast a reversed reflection. Bill asked Heather not to leave without her. As a result, when Heather was taken over by the puddle, she followed Bill home, so as not to leave without her.


Bill went to [[the Doctor's office (The Pilot)|the Doctor's office]], and then he brought her into [[The Doctor's TARDIS|the TARDIS]]. He tried to outrun the water creature, and finally travelled to a [[War zone (The Pilot)|war zone]] in the [[Dalek-Movellan War]]. Bill realised she was being pursued as Heather had promised not to leave without her. On the Doctor's advice, she released Heather from her promise.
Bill went to [[the Doctor's office (The Pilot)|the Doctor's office]], and then he brought her into [[The Doctor's TARDIS|the TARDIS]]. He tried to outrun the water creature, at first travelling to [[Sydney]], [[Australia]], then to a faraway planet, and, finally, a [[War zone (The Pilot)|war zone]] in the [[Dalek-Movellan War]]. Bill realised she was being pursued as Heather had promised not to leave without her. On the Doctor's advice, she released Heather from her promise.


The Doctor took her back to the university, where Bill expressed regret at having turned down Heather's offer, with the Doctor telling her it was unlikely they would ever see each other again. When Bill knowingly looked at the TARDIS, the Doctor realised what she was suggesting and made her stand close to him, intending to [[memory wipe|wipe her memory]] of these events, but she convinced him not to. He then agreed to take Bill with him on his travels, acknowledging that they might run into Heather one day. ([[TV]]: ''[[The Pilot (TV story)|The Pilot]]'')
The Doctor took her back to the university, where Bill expressed regret at having turned down Heather's offer, with the Doctor telling her it was unlikely they would ever see each other again. When Bill knowingly looked at the TARDIS, the Doctor realised what she was suggesting and made her stand close to him, intending to [[memory wipe|wipe her memory]] of these events, but she convinced him not to. He then agreed to take Bill with him on his travels, acknowledging that they might run into Heather one day. ([[TV]]: {{cs|The Pilot (TV story)}})


=== Travels with the Doctor ===
=== Travels with the Doctor ===
[[File:Bill explores Gliese581d.jpg|thumb|left|Bill explores [[Gliese 581d]]. ([[TV]]: ''[[Smile (TV story)|Smile]]'')]]
[[File:Bill explores Gliese581d.jpg|thumb|Bill explores [[Planet (Smile)|a human colony]]. ([[TV]]: {{cs|Smile (TV story)}})]]
The Doctor took Bill to visit a [[Gliese 581d|human colony]] in the [[far future]] lying to Nardole that he was just transporting the TARDIS back to the office. When the Doctor discovered the [[Vardy]] robots had killed the set-up team on the colony, the pair escaped the colony, running from the Vardies and [[Emojibot]]s, but the Doctor ran back in to attempt to destroy the base for the sake of the coming settlers. The Doctor wanted Bill to stay behind, but Bill followed him, believing that the reason the Doctor kept the TARDIS in the shape of a police box and why he didn't ask for help was because he ''was'' the helpline. The Doctor showed her that the Vardies were actually a part of the building and had constructed the colony using themselves. He had Bill give him directions to the main power centre using a map before Bill realised he had memorised the schematics and was keeping her at the map to keep her out of trouble. Bill was horrified to discover the colonists were the last humans in existence after Earth was evacuated.
The Doctor took Bill to visit a [[Planet (Smile)|human colony]] in the [[far future]], telling Nardole that he was just transporting the TARDIS back to the office. When the Doctor discovered the [[Vardy]] robots had killed the set-up team on the colony, the pair almost blew up the ship around which the city had been built before realising that the colonists had already arrived and were in [[hibernation]]. The Doctor stopped the bomb, and the pair deduced that the Vardies had been built to sustain happiness and had come to view grief as a plague.


As soon as the Doctor had wired [[Erehwon|the ship]] the city had been built around to blow, Bill emerged with a boy called [[Praiseworthy]]. The Doctor realised that the colonists had already arrived in hibernation waiting for the ship to wake them up, and entering the ship woke the colonists. The Doctor stopped the bomb, and the pair deduced that the Vardies had been built to sustain happiness and had come to view grief as a plague.
The Doctor rebooted the Vardies, erasing their memories of the [[human]]s, before beginning diplomatic negotiations between the humans and Vardies. He then tried to return to the university just after they left, but when he and Bill exited the TARDIS, they discovered they were outside in winter with an elephant in front of them. ([[TV]]: {{cs|Smile (TV story)}})


The Doctor rebooted the Vardies, erasing their memories of the [[human]]s, before beginning diplomatic negotiations between the humans and Vardies. He then tried to return to the university just after they left, but when he and Bill exited the TARDIS, they discovered they were outside in winter with an elephant in front of them. ([[TV]]: ''[[Smile (TV story)|Smile]]'')
On exploring [[London]] in [[1814]], the Doctor and Bill attended the last [[Frost Fair]] on the [[River Thames]] before noticing strange lights under the ice. Bill witnessed firsthand the death of a little boy when he was sucked under the ice and was horrified and disgusted when the Doctor seemed to care more about retrieving his sonic screwdriver than the boy who had been stolen. Bill challenged the Doctor demanding to know whether he had ever killed anyone to which he confirmed saying that he did not have the luxury for outrage as he was 2000 years old. Bill befriended the urchins who had originally stolen from them and chose to cooperate with the Doctor. Their investigation led them to [[Sutcliffe (Thin Ice)|Lord Sutcliffe]] with the Doctor warning Bill to let him do the talking as it required a diplomatic approach. After Sutcliffe made racist remarks towards Bill, however, the Doctor punched him in the face. Later Bill agreed with the Doctor to set the creature in the Thames free, surprised when it wasn't headline news in the present day. ([[TV]]: {{cs|Thin Ice (TV story)}})
[[File:DWM 512 The Soul Garden Bill meets Rudy Zoom.jpg|thumb|Bill meets [[Rudy Zoom]]. ([[COMIC]]: {{cs|The Soul Garden (comic story)}})]]
The Doctor took Bill to [[Titan]] to see a clear image of [[Saturn]], her favourite planet. He then introduced her to the concept of "swimming" in the gravity-deprived atmosphere, although this was cut short when the area around them was heavily disturbed by a passing [[Beagle (ship)|land ship]]. When the pair were rescued by the passing vehicle, Bill was introduced to [[Rudy Zoom]], the financier of the voyage. The two soon met [[Takashi|Lady Takashi]], a psychic who felt an alien presence on Titan years ago in a sleep. The ship changed its buoyancy to float on the methane river. After several hours, they found a domed-off [[The Garden (The Soul Garden)|garden]] in a cavern, which they investigated on foot. The Doctor noticed that all of the vegetation inside was sentient, except for two trees in the centre. The group was scattered when [[Keeper (The Soul Garden)|a robot]] attacked them, believing them to be weeds. As Bill hid in the garden, she was attacked by one of the [[Haluu]] plants and passed out. Bill found herself in the [[Dreamspace]] where [[Sythorr]] — who was the giant Haluu below the two trees — chased Bill and Rudy in an attempt to wipe their minds as part of his plan to take over Earth. They escaped and projected themselves into the real world until they woke up. Sythorr's lover [[Oksanna]] ordered Bill and Rudy to be released. As they ran for the doors, Oksanna sacrificed her life to destroy Sythorr and the domed garden. After making it to the ship, Bill saw the last piece of Sythorr warn the Doctor before dying that "The unknown soldier...is stirring." ([[COMIC]]: {{cs|The Soul Garden (comic story)}})


On exploring [[London]] in [[1814]], The Doctor and Bill attended the last [[Frost Fair]] on the [[River Thames]] before noticing strange lights under the ice.  Bill witnessed firsthand the death of a little boy when he was sucked under the ice and was horrified and disgusted when the Doctor seemed to care more about retrieving his sonic screwdriver that the boy had stolen. Bill challenged the Doctor demanding to know whether he had ever killed anyone to which he confirmed saying that he did not have the luxury of for outrage as he was 2000 years old.  Bill befriended the urchins who had originally stolen from them and chose to cooperate with the Doctor.  Their investigation led them to [[Sutcliffe (Thin Ice)|Lord Sutcliffe]] with the Doctor warning Bill to let him do the talking as it required a diplomatic approach. After Sutcliffe made racist remarks towards Bill, however, the Doctor punched him in the face.  Later Bill agreed with the Doctor to set the Monster in the Thames free, surprised when it wasn't headline news in the present day.  ([[TV]]: ''[[Thin Ice (TV story)|Thin Ice]]'')
The Doctor and Bill landed in the [[Indian Territory]] in [[1880]], where the outlaw [[Seth Shelton]] tried to hold Bill hostage. She was saved by United States Deputy Marshal [[Bass Reeves]] and the scout [[Joey Two Trees]], who had Shelton arrested and intended to take him back to [[Arkansas]] to stand trial. While Reeves, Joey and the Doctor took off, Seth's brother [[Frank Shelton]] arrived at Reeves' wagon and freed Seth. Seth and Frank waited for the Doctor and his friends to return so they could kill them. The [[Seminole]] [[medicine woman]] [[Totika]] summoned the [[Stikini]] who killed the Sheltons by ripping their hearts from their bodies. The Stikini threatened the life of [[Zeke Tolbert]], but Bill promised to tell Totika the truth about Bill's travels to other worlds. Totika then put Bill to the test to swap her body with Stikini War-Queen [[Cocheta]] in the [[Red Skies]], a region of the Dreamspace the Stikini were native to. The Doctor and Reeves freed Bill during the ceremony, but the ceremony succeeded. In the Red Skies, Bill met the other Seminole Totika had banished. The Doctor contacted Bill, telling her where she was. Bill and the Seminole willed themselves out of the Red Skies, forcing the Stikini back there. Reeves and Joey destroyed the totem used in Totika's ceremonies. Afterwards, the sky opened up, and the group saw the Stikini get burnt by an unknown force in the Red Skies. Returning to the TARDIS, the Doctor and Bill saw the TARDIS had impossible carvings on its exterior, and the Doctor demanded answers. ([[COMIC]]: {{cs|The Parliament of Fear (comic story)}})
[[File:DWM 512 The Soul Garden Bill meets Rudy Zoom.jpg|thumb|Bill meets [[Rudy Zoom]]. ([[COMIC]]: ''[[The Soul Garden (comic story)|The Soul Garden]]'')]]
The Doctor took Bill to [[Titan]] to see a clear image of [[Saturn]], her favourite planet. He then introduced her to the concept of "swimming" in the gravity-deprived atmosphere, although this was cut short when the area around them was heavily disturbed by a passing [[Beagle (ship)|land ship]]. When the pair were rescued by the passing vehicle, Bill was introduced to [[Rudy Zoom]], the financier of the voyage. The two soon met Lady [[Takashi]], a psychic who felt an alien presence on Titan years ago in a sleep. The ship changed its buoyancy to float on the methane river. After several hours, they found a domed-off [[The Garden (The Soul Garden)|garden]] in a cavern, which they investigated on foot. The Doctor noticed that all of he vegetation inside was sentient, except for two trees in the centre. The group was scattered when [[Keeper (The Soul Garden)|a robot]] attacked them, believing them to be weeds. As Bill hid in the garden, she was attacked by one of the [[Haluu]] plants and passed out. Bill found herself in the [[Dreamspace]] where [[Sythorr]] — who was the giant Haluu below the two trees — chased Bill and Rudy in an attempt to wipe their minds as part of his plan to take over Earth. They escaped and projected themselves into the real world until they woke up. Sythorr's lover [[Oksanna]] ordered Bill and Rudy to be released. As they ran for the doors, Oksanna sacrificed her life to destroy Sythorr and the domed garden. After making it to the ship, Bill saw the last piece of Sythorr warn the Doctor before dying that "The unknown soldier...is stirring." ([[COMIC]]: ''[[The Soul Garden (comic story)|The Soul Garden]]'')


The Doctor and Bill landed in the [[Indian Territory]] in [[1880]], where the outlaw [[Seth Shelton]] tried to hold Bill hostage. She was saved by United States Deputy Marshal [[Bass Reeves]] and the scout [[Joey Two Trees]], who had Shelton arrested and intended to take him back to [[Arkansas]] to stand trial. While Reeves, Joey and the Doctor took off, Seth's brother [[Frank Shelton]] arrived at Reeves' wagon and freed Seth. Seth and Frank waited for the Doctor and his friends to return so they could kill them. The [[Seminole]] [[medicine woman]] [[Totika]] summoned the [[Stikini]] who killed the Sheltons by ripping their hearts from their bodies. The Stikini threatened the life of [[Zeke Tolbert]], but Bill promised to tell Totika the truth about Bill's travels to other worlds. Totika then put Bill to the test to swap her body with Stikini War-Queen [[Cocheta]] in the [[Red Skies]], a region of the Dreamspace the Stikini were native to. The Doctor and Reeves freed Bill during the ceremony, but the ceremony succeeded. In the Red Skies, Bill met the other Seminole Totika had banished. The Doctor contacted Bill, telling her where she was. Bill and the Seminole willed themselves out of the Red Skies, forcing the Stikini back there. Reeves and Joey destroyed the totem used in Totika's ceremonies. Afterwards, the sky opened up, and the group saw the Stikini get burnt by an unknown force in the Red Skies. Returning to the TARDIS, the Doctor and Bill saw the TARDIS had impossible carvings on its exterior, and the Doctor demanded answers. ([[COMIC]]: ''[[The Parliament of Fear (comic story)|The Parliament of Fear]]'')
Searching for answers about the carving on the TARDIS, the Doctor came to the [[Renath Archive]] library on [[Cornucopia]] to try to identify it. Angered by the head librarian [[Matildus Galathea]]'s snobiness, Bill went outside to the [[Kaballus Quarter]] for some fresh air. Noticing Bill was the first to come in or out of the library in months, the [[Kaballus Kids]] captured Bill, and told her that Matildus used to let them hang around before she behaved strangely and barred the kids. Bill showed them a photo of Matildus being grumpy, which revealed something strange around her head.


Searching for answers about the carving on the TARDIS, the Doctor came to the [[Renath Archive]] library on [[Cornucopia]] to try to identify it. Angered by the head librarian [[Matildus Galathea]]'s snobbiness, Bill went outside to the [[Kaballus Quarter]] for some fresh air. Noticing Bill was the first to come in or out of the library in months, the [[Kaballus Kids]] captured Bill, and told her that Matildus used to let them hang around before she behaved strangely and barred the kids. Bill showed them a photo of Matildus being grumpy, which revealed something strange around her head.
Returning to the library with the Kaballus Kids, Bill told the Doctor, Matildus and [[Sashana]] to stop whatever it was they were doing. Bill took a photograph on her phone which revealed Sashana's true form. Sashana revealed that she was psychically sowing doubt in Matildus' mind and blocking her memories so Sashana could sell off the library's collection after being handed custody of it. She began to fry the group's brains with her mind, but was stopped after Bill summoned the [[Ristallian crater-hound]] [[Archie (Matildus)|Archie]], whose simple brain couldn't be kept back. After Sashana was arrested, the Doctor realised the carving wasn't a symbol, but a coded message. The Doctor and Bill's next destination to break the code was to see [[Alan Turing]]. ([[COMIC]]: {{cs|Matildus (comic story)}})


Returning to the library with the Kaballus Kids, Bill told the Doctor, Matildus and [[Sashana]] to stop whatever it was they were doing. Bill took a photograph on her phone which revealed Sashana's true form. Sashana revealed that she was psychically sowing doubt in Matildus' mind and blocking her memories so Sashana could sell off the library's collection after being handed custody of it. She began to fry the group's brains with her mind, but was stopped after Bill summoned the [[Ristallian crater-hound]] [[Archie (Matildus)|Archie]], whose simple brain couldn't be kept back. After Sashana was arrested, the Doctor realised the carving wasn't a symbol, but a coded message. The Doctor and Bill's next destination to break the code was to see [[Alan Turing]]. ([[COMIC]]: ''[[Matildus (comic story)|Matildus]]'')
The Doctor and Bill went to visit the [[Galatean]] duplicate of Alan Turing on the [[The Moon|lunar]] colony [[Athenia]] to decipher the markings on the TARDIS. However, Alan had vanished two years previously. The Galatean [[Chiyoko]], feeling her "mother" (the TARDIS's essence on Bill), had Bill take Chiyoko to the TARDIS, which Chiyoko could hear was screaming due to the markings on the TARDIS's shell. After reuniting with the Doctor, Chiyoko told him where to find Alan. They found Alan inside a replica of [[King's College]], [[University of Cambridge|Cambridge]] on the Moon's surface. The arrival of the TARDIS caused the code, which was part of the Dreamspace-dwelling [[Phantom Piper]], to make the Piper manifest through Alan using [[Block Transfer Computation]]. When the Phantom Piper used Chiyoko's mind to create soldiers from every war to start a war between humans and Galateans. Bill told [[Maggie Cortez]] not to kill Chiyoko, and told Maggie to trust the Doctor. With the help of a suggestion from the Doctor, Alan defeated the Piper by breaking down his code, allowing Chiyoko to live. ([[COMIC]]: {{cs|The Phantom Piper (comic story)}})


The Doctor and Bill went to visit the [[Galatean]] duplicate of Alan Turing on the [[The Moon|lunar]] colony [[Athenia]] to decipher the markings on the TARDIS. However, Alan had vanished two years previously. The Galatean [[Chiyoko]], feeling her "mother" the TARDIS' essence on Bill, had Bill take Chiyoko to the TARDIS, which Chiyoko could hear was screaming due to the markings on the TARDIS' shell. After reuniting with the Doctor, Chiyoko told him where to find Alan. They found Alan inside a replica of [[King's College]], [[University of Cambridge|Cambridge]] on the Moon's surface. ([[COMIC]]: ''[[The Phantom Piper (comic story)|The Phantom Piper]]'')
Shortly afterwards, the Doctor and Bill ended up stranded in an entropy bubble in space, as part of an elaborate trap by [[Fey Truscott-Sade]] to capture time travellers, including the Doctor. During an attack by the Clockwise Men, Bill helped [[Gol Clutha]] attack them with a proton cannon, but was powerless to stop them ageing Gol to death. Escaping, the Doctor and Bill landed back on Cornucopia, where Bill shouted at him for not telling her enough about what was going on. After apologising and meeting [[Annabel Lake]], Bill narrowly avoided being shot at by Fey during their flight to Wonderland HQ, leaving her shaken for being targeted instead of the Doctor.


She later helped investigate and stop the [[Shining Men]], ([[PROSE]]: ''[[The Shining Man (novel)|The Shining Man]]'') and visited [[Kollo-Zarnista Mining Facility 27]] above [[Saturn]]. ([[PROSE]]: ''[[Diamond Dogs (novel)|Diamond Dogs]]'')
After the Doctor explained to Bill his past with Fey during the Time War, they met with Matildus, where Bill watched over the Doctor as he fell asleep to meet Fey in the Dreamspace. Later, when it was discovered that Fey's only surviving relative, [[Alexander Truscott]], was probably behind things, Bill recognised him from his appearances on TV. After she and the Doctor got captured in an attempt to storm Truscott's house, they eventually escaped, where Bill first noticed the globes from London's CCTV cameras floating and forming around Fey, preparing to attack. The globes reconstituted as [[Shayde]] around Fey, and Bill joined the Doctor's group in entering the Dreamspace inside. After Fey attacked the Doctor, Bill finally got her to listen by explaining how the Doctor always tries to do what is right, allowing the Doctor to reveal the truth to her: that the Absence was never real. After the revived Shayde wiped Fey's memory of her time with him at the cost of his own life, Bill joined the Doctor in placing her safely in Wonderland in London, although she was upset that the Doctor never said goodbye to her. ([[COMIC]]: {{cs|The Clockwise War (comic story)}})


Bill and five other university students were looking for accommodation when [[the Landlord]] invited them to stay in [[11 Cardinal Road]]. The Doctor also investigated and discovered the Landlord was feeding students to the [[Dryads]], insects who were working with the Landlord to keep his mother [[Eliza (Knock Knock)|Eliza]] alive. Bill led her own investigation and discovered the secret of the house. After the Landlord was defeated, the house disintegrated. ([[TV]]: ''[[Knock Knock (TV story)|Knock Knock]]'') She later moved back in with her foster mother ([[TV]]: [[Extremis (TV story)|''Extremis'']])
She later helped investigate and stop the [[Shining Man|Shining Men]], ([[PROSE]]: {{cs|The Shining Man (novel)}}) and visited [[Kollo-Zarnista Mining Facility 27]] above [[Saturn]]. ([[PROSE]]: {{cs|Diamond Dogs (novel)}})
 
Bill and five other university students were looking for accommodation when [[the Landlord]] invited them to stay in [[11 Cardinal Road]]. The Doctor also investigated and discovered the Landlord was feeding students to the [[Dryad]]s, insects who were working with the Landlord to keep his mother [[Eliza (Knock Knock)|Eliza]] alive. Bill led her own investigation and discovered the secret of the house. After the Landlord was defeated, the house disintegrated. ([[TV]]: {{cs|Knock Knock (TV story)}}) She later moved back in with her foster mother. ([[TV]]: {{cs|Extremis (TV story)}})
 
While travelling, the TARDIS was drawn to the [[9th century]], in the Northern reaches of the [[Atlantic Ocean]]. Allying with a group of Vikings, the Doctor and Bill discovered a group of Ice Warriors attempting to contain [[The Flood (The Waters of Mars)|The Flood]]. Though the Doctor initially attempted to parlay with the Flood, he soon realised that they were caught in a time loop relating to his adversary [[Fenric]]. Having Bill evacuate the Ice Warriors, the Doctor detonated a volcano to destroy the Flood strain, before evacuating everyone. ([[COMIC]]: {{cs|The Wolves of Winter (comic story)}})
 
Bill later bore witness to the Doctor bringing peace to a [[Planet (The Promise)|planet]] populated by [[clone]]s of his old friend [[Plex]]. He later told her the true story of how the clones' society came to be. ([[COMIC]]: {{cs|The Promise (FCBD comic story)}})
 
When preparing for a date, Bill had her identity stolen by an [[Ohcho]] named [[Ziggy (Bill and the Three Jackets)|Ziggy]], the Doctor dismissing her when she tried to get his help. Recruiting [[Lou (Bill and the Three Jackets)|Lou]], Bill managed to convince the Doctor of both her identity and to help Ziggy return home. ([[PROSE]]: {{cs|Bill and the Three Jackets (short story)}})
 
When a temporal crisis rendered [[TARDIS]] travel all but impossible, the Twelfth Doctor became stranded on Gallifrey with Bill Potts. There, he acquired a stash of [[Kyfred Gem]]s and came up with the idea of using them to stabilise the [[temporal energy]] by throwing them into the Untempered Schism "like skipping stones". Bill accompanied the Doctor to the Schism, but had to wear a protective shield to avoid the sight of the Schism "melting her [[brain]]". They then split up with Bill returning to the Panopticon, where she was confronted with [[Nardole]] — much to her surprise, as she hadn't previously realised that he'd hitched a ride on this particular TARDIS trip. ([[GAME]]: {{cs|Lost in Time (video game)}})


=== Travels with the Doctor and Nardole ===
=== Travels with the Doctor and Nardole ===
After a time, Nardole joined the Doctor and Bill on off-world adventures. The trio travelled to [[Edinburgh]] in [[1645]]. ([[PROSE]]: ''[[Plague City (novel)|Plague City]]'')
[[File:Bill succumbs to vacuum (Oxygen).jpg|thumb|left|Bill is exposed to the [[vacuum]] of [[space]]. ([[TV]]: {{cs|Oxygen (TV story)}})]]
 
Bill visited the mining station named [[Chasm Forge]] after the TARDIS received a distress call from it. As oxygen was regulated and the TARDIS exterior air shell was being removed, Bill had to wear a [[smartsuit]] that provided her with a force field which held air in. When entering an airlock which required a solid physical helmet, Bill's malfunctioning suit automatically took her helmet off. This meant Bill was exposed to the vacuum of space. The Doctor later gave her his helmet, at the cost of his sight. ([[TV]]: {{cs|Oxygen (TV story)}})
[[File:Bill succumbs to vacuum (Oxygen).jpg|thumb|left|Bill is exposed to the [[vacuum]] of [[space]]. ([[TV]]: ''[[Oxygen (TV story)|Oxygen]]'')]]
Bill visited the mining station named [[Chasm Forge]] after the TARDIS received a distress call to visit it. As oxygen was regulated and the Tardis exterior air shell was being removed, Bill had to wear a [[smartsuit]] that provided her with a force field which held air in. When entering an airlock which required a solid physical helmet, Bill's malfunctioning suit automatically took her helmet off. This meant Bill was exposed to the vacuum of space. The Doctor later gave her his helmet, at the cost of his sight. ([[TV]]: ''[[Oxygen (TV story)|Oxygen]]'')


After viewing an email from his [[Twelfth Doctor (Shadow World)|virtual counterpart]], the Doctor called Bill asking if she knew a person called [[Penny (The Pyramid at the End of the World)|Penny]]. Bill did, but deemed her "out of [her] league". The Doctor assured her she wasn't and told her to call Penny that night as he had a "feeling [they were] going to be very busy". ([[TV]]: ''[[Extremis (TV story)|Extremis]]'')
After viewing an email from his [[Twelfth Doctor (Shadow World)|virtual counterpart]], the Doctor called Bill asking if she knew a person called [[Penny (The Pyramid at the End of the World)|Penny]]. Bill did, but deemed her "out of [her] league". The Doctor assured her she wasn't and told her to call Penny that night as he had a "feeling [they were] going to be very busy". ([[TV]]: {{cs|Extremis (TV story)}})


Bill went on a date with Penny and told her about the [[Shadow World|virtual world]] the Doctor had since told her about. Penny was disbelieving, but the date was going well until armed soldiers and the Secretary-General of the UN arrived to collect Bill and take her to see a pyramid that had appeared overnight. On board the Doctor's [[Boat One|President plane]], Bill tried to convince the Doctor in the TARDIS to come and help with the pyramid - but he denied until he realised he didn't have a choice as the TARDIS had already been loaded onto the plane.
Bill went on a date with Penny and told her about the [[Shadow World|virtual world]] the Doctor had since told her about. Penny was disbelieving, but the date was going well until armed soldiers and the Secretary-General of the UN arrived to collect Bill and take her to see a pyramid that had appeared overnight. On board the Doctor's [[Boat One|President plane]], Bill tried to convince the Doctor in the TARDIS to come and help with the pyramid - but he denied until he realised he didn't have a choice as the TARDIS had already been loaded onto the plane.


At the pyramid, Bill was confused when Nardole was 'updating' the Doctor on what was happening in front of them as the latter approached. Her phone, like every other device with a clock, received a message saying 23:57pm as [[the Monks]] started a countdown to the end of the Earth, demanding surrender. The Doctor, Bill and Nardole then took the Heads of the [[US Army|American]], [[Russian army|Russian]] and [[Chinese army|Chinese armies]] and had them strike the pyramid in a coordinated attack.
At the pyramid, Bill was confused when Nardole was 'updating' the Doctor on what was happening in front of them as the latter approached the pyramid. Her phone, like every other device with a clock, received a message saying 23:57 pm as the [[Monk (species)|Monks]] started a countdown to the end of the Earth, demanding surrender. The Doctor, Bill and Nardole then took the Heads of the [[US Army|American]], [[Russian army|Russian]] and [[Chinese army|Chinese armies]] and had them strike the pyramid in a coordinated attack.


The Monks stopped the attacks with ease and expressed they were ready to talk. Inside, the Monks revealed that Earth would be dead in a year's time if the planet did not consent to the Monks' help.
The Monks stopped the attacks with ease and expressed they were ready to talk. Inside, the Monks revealed that Earth would be dead in a year's time if the planet did not consent to the Monks' help.


The Doctor was against consenting to something he didn't understand, though Bill and the others were more willing. However the Monks explained that Love was needed in consent, burning the Secretary-General when he consented out of Fear.
The Doctor was against consenting to something he didn't understand, though Bill and the others were more willing. However, the Monks explained that love was needed in consent, burning the Secretary-General when he consented out of fear.
 
Back on board the President plane, the army heads agreed not to fight one another believing that they would be stopping World War III, but this failed to revert the clocks. Bill compared the need for consent as to inviting vampires into a person's home. She also theorised a bacterial possibility and the Doctor had them all Google possible problems. However, Bill and the army heads were considering surrendering Earth to ensure the planet survived, unwilling to put such risk especially when the clocks moved to 23:58 pm.
 
As the Doctor and Nardole deduced the problem as a biological component released in a lab, Bill and the army leaders went to the Pyramid as the countdown reached 23:59pm. Inside, the army leaders were burned by the Monks for consenting out of strategy. Bill went to leave when the Doctor managed to solve the biological problem and the countdown began to go backwards. However, when the Doctor could not leave due to being blind and unable to spin the combination lock, Bill returned and consented to the Monks having authority over the Doctor in return for his sight being restored. Before the Monks accepted her 'pure' consent out of love, she told the Doctor to save her planet. ([[TV]]: {{cs|The Pyramid at the End of the World (TV story)}})
 
Bill was reunited with Nardole during the Monks' reign over Earth. She had been away from Nardole and the Doctor for six months since their last adventure. The Monks had inserted themselves into history during this time, however, Bill had refused to fall for the mental deception.
 
Nardole located Bill and helped her find the prison hulk where he believed the Doctor was making his broadcasts and was captive there. The Doctor told Bill he was cooperating willingly with the Monks, believing that humanity was doomed without their guidance. Bill became distraught and shot the Doctor with a gun she took from one of the [[SWAT]] troops, who appeared to begin regenerating, but quickly stopped. The entire scenario was revealed to have been a test by Nardole, the Doctor and the team, to make sure Bill was not under the influence of the Monks.


Back on board the President plane, the army heads agreed not to fight one another believing that they would be stopping World War III, but this failed to revert the clocks. Bill compared the need for consent as to inviting vampires into a person's home. She also theorised a bacterial possibility and the Doctor had them all Google possible problems. However, Bill and the army heads were considering surrendering Earth to ensure the planet survived, unwilling to put such risk especially when the clocks moved to 23:58pm.
At the university where the Doctor and Bill worked, they entered the Vault to talk to [[Missy]], who said she had encountered the Monks before. She confirmed the Monks maintained control by broadcasting a signal containing the false history to their subjugated victims via the numerous statues they had built across Earth, enabled by a psychic link established through the person who originally gave "consent"; Missy claimed to have defeated them during her own encounter by killing that individual. She implied that Bill must die as the one who gave consent on Earth.


As the Doctor and Nardole deduced the problem as a biological component released in a lab, Bill and the army leaders went to the Pyramid as the countdown reached 23:59pm.  Inside, the army leaders were burned by the Monks for consenting out of Strategy.  Bill went to leave when the Doctor managed to solve the biological problem and the countdown began to go backwards.  However, when the Doctor could not leave due to being blind and unable to spin the combination lock, Bill returned and consented to The Monks have authority over the Doctor in return for his sight being restored. Before the Monks accepted her 'pure' consent out of Love, she told the Doctor to save her planet. ([[TV]]: ''[[The Pyramid at the End of the World (TV story)|The Pyramid at the End of the World]]'')
Bill accepted her fate, but the Doctor was determined for another solution. Along with Nardole and the SWAT troops, they infiltrated the Monks' pyramid in London so that the Doctor could hijack their broadcast with his own mind to break the psychic transmission. In the central chamber, the Doctor attempted to link his mind to the controlling Monk, who after a struggle overpowered the Doctor. Bill intended to sacrifice herself, linking her own mind to the Monk's despite the Doctor's protests. The Monks' broadcast was replaced with images of Bill's mother, which the Doctor recognised as a strong and loving memory in Bill's mind. Humanity woke up from the Monks' lies and revolted against them. The Doctor, Bill, and Nardole watched as the Monks abandoned Earth. Sometime later, the Doctor and Bill found that most of humanity had no recollection of the Monks. ([[TV]]: {{cs|The Lie of the Land (TV story)}})


Bill was reunited with Nardole during the Monks' reign over Earth. She had been away from Nardole and the Doctor for six months since their last adventure. The Monks had inserted themselves into history during this time, however Bill had refused to fall for the mental deception.
When the Doctor was "correcting" the books of the [[Terrance Dicks Library]], the building was demolished by a [[bowship]] piloted by the Doctor's daughter, [[Jenny (The Doctor's Daughter)|Jenny]]. After Jenny had explained the events that led to her arrival, Bill was ready to help only to be shocked by the white energy that emanated from the Void, finding she was immune to it. As "possessed" UNIT forces arrived and starting advancing menacingly, the Doctor ushered everyone into the TARDIS only to find it had been merged with that of [[Tenth Doctor|his tenth incarnation]], with the [[Eighth Doctor|Eighth]] and [[Ninth Doctor]]s soon arriving. The Doctors managed to trace and neutralise the malignant energy but doing so left only the Twelfth Doctor with any memories of what had happened, him happily taking Bill and Nardole away to tell them what had just happened. ([[COMIC]]: {{cs|The Lost Dimension (comic story)}})


Nardole located Bill and helped her find the prison hulk where he believed the Doctor was making his broadcasts and was captive there. The Doctor told Bill he was cooperating willingly with the Monks, believing that humanity was doomed without their guidance. Bill became distraught and shot the Doctor with a gun she took from one of the SWAT troops, who appears to begin regenerating, but quickly stops. The entire scenario is revealed to have been a test by Nardole, the Doctor and the team, to make sure Bill was not under the influence of the Monks.
With Nardole joining the Doctor and Bill on off-world adventures, the trio visited [[NASA]] and discovered the phrase "God Save the Queen" on the surface of [[Mars]]. The trio arrived on Mars in 1881 and Bill became separated from the Doctor when she fell down a hole, causing Nardole to return to the TARDIS and get stuck there when the TARDIS returned to Earth. The Doctor and Bill reunited and discovered an [[Ice Warrior]] called [[Friday (Empress of Mars)|Friday]] working with a group of Victorian soldiers. The Doctor and Bill pretended to be from the police. After the [[Iraxxa|Empress]] was awoken, Bill and the Doctor were locked up by [[Neville Catchlove|Captain Catchlove]], who wanted Mars for himself. Friday rescued them and Bill attempted to prevent an all-out war between the Ice Warriors and the humans. When the crisis was resolved, the TARDIS returned and Bill learnt that Missy had been let out of the Vault by Nardole to rescue them. ([[TV]]: {{cs|Empress of Mars (TV story)}})


At the university where the Doctor and Bill worked, they entered the Vault to talk to {{Gomez}}, who said she had encountered the Monks before. She confirmed the Monks maintain control by broadcasting a signal containing the false history to their subjugated victims via the numerous statues they have built across Earth, enabled by a psychic link established through the person who originally gave "consent"; Missy claimed to have defeated them during her own encounter by killing that individual. She implied that Bill must die as the one who gave consent on Earth.
Bill, the Doctor and Nardole travelled to [[Edinburgh]] in [[1645]], where they encountered a city plagued by Ghosts and the actual Plague. ([[PROSE]]: {{cs|Plague City (novel)}})


Bill accepted her fate, but the Doctor was determined for another solution. Along with Nardole and the SWAT troops, they infiltrated the Monks' pyramid in London so that the Doctor could hijack their broadcast with his own mind to break the psychic transmission. In the central chamber, the Doctor attempted to link his mind to the controlling Monk, who after a struggle overpowered the Doctor. Bill intended to sacrifice herself, linking her own mind to the Monk's despite the Doctor's protests. The Monks' broadcast was replaced with images of Bill's mother, which the Doctor recognises is a strong and loving memory in Bill's mind. Humanity woke up from the Monks' lies and revolted against them. The Doctor, Bill, and Nardole watched as the Monks abandoned Earth. Sometime later, the Doctor and Bill find that most of humanity had no recollection of the Monks. ([[TV]]: ''[[The Lie of the Land (TV story)|The Lie of the Land]]'')
When the Vault needed a new [[Relative Dimensional Stabiliser]], the Doctor took Bill and Nardole to [[Übermarket]] where Bill helped a lost [[Pathicol]] child called [[Tyto]] find her parents. ([[COMIC]]: {{cs|The Great Shopping Bill (comic story)}})


Bill, along with the Doctor and Nardole, visited [[NASA]] and discovered the phrase "God Save the Queen" on the surface of [[Mars]]. The trio arrived on Mars in 1881 and Bill became separated from the Doctor when she fell down a hole, causing Nardole to return to the TARDIS and get stuck there when the TARDIS returned to Earth. The Doctor and Bill reunited and discovered an [[Ice Warrior]] called [[Friday (Empress of Mars)|Friday]] working with a group of Victorian soldiers. After the [[Iraxxa|Empress]] was awoken, Bill and the Doctor were locked up by [[ Neville Catchlove|Captain Catchlove]], who wanted Mars for himself. Friday rescued them and Bill attempted to prevent an all out war between the Ice Warriors and the humans. When the crisis was resolved, the TARDIS returned and Bill learnt that Missy had been let out of the Vault by Nardole to rescue them ([[TV]]: ''[[Empress of Mars (TV story)|Empress of Mars]]'')
When the Doctor was drawn to the inactive ''[[Jeden]]'', Bill encountered the Heavenly Hosts. As the ship became more dangerous, the Doctor instructed Bill to return to the TARDIS and activate [[Emergency Protocol 13-9]] which granted Missy remote control of the TARDIS. As the ship dematrialised, Bill saw a sign that read "FIND ME, BILL!" from the Doctor. Rushing to find him, Bill was too late to warn him of a [[Weeping Angel]] behind him.


After getting into an argument with the Doctor about the fate of the Ninth Roman Legion, Bill and the Doctor, along with a reluctant Nardole, the TARDIS arrived in [[2nd century]] [[Scotland]]. Bill once again got separated from the Doctor when she was chased by [[Kar]] and then encountered a [[Roman]]. She witnessed the Roman get eaten by a [[Eater of Light|mysterious creature]] and got rescued by the remaining Romans, who survived the creature's attack by running away. After being knocked unconscious for two days by the creature's slime, Bill awoke and worked with the Romans to find the Doctor. Upon being attacked by the creature again, Bill and the Romans escaped and encountered the Doctor and Nardole with the Picts. Bill and the Doctor helped the two sides work together and then worked to send the creature back through the portal where it came from. When the Doctor attempted to stay behind and guard the gate, Bill knocked him to the ground to stop him and reminded him of his duties to guard the vault on Earth. When they returned to the TARDIS, Bill and Nardole discovered that the Doctor had let Missy out of the vault for "maintenance". Despite his two companions not trusting him, the Doctor maintained the belief that Missy could change. ([[TV]]: ''[[The Eaters of Light (TV story)|The Eaters of Light]]'')
As more and more Angels began appearing, Bill volunteered to try and vent the Angels into space before she reunited with the Doctor, having been sent back in time and arranged for his return. When it was found that the Weeping Angels were using the Heavenly Hosts as breeding stock, the Doctor evacuated the ''Jeden'', leaving it to be consumed by a red giant star before taking everyone back to Earth. ([[COMIC]]: {{cs|A Confusion of Angels (comic story)}})


Bill and Nardole, watched over by the Doctor, became Missy's companions on a test trip to determine whether she could reform from her evil ways. While surveying the [[Colony ship (World Enough and Time)|colony ship]] they were on, Bill was mockingly called the "exposition" by Missy. Bill was mortally wounded by a paranoid technician who was the only one left of his crew, due to her being human and supposedly a target for an unknown threat. Unable to save her, the Doctor allowed her to be taken by [[Patient (World Enough and Time)|medical figures]] who had come from the lower levels of the ship as he understood were capable of healing her. He left a message in her subconscious for the moment she awoke: "wait for me". ([[TV]]: ''[[World Enough and Time (TV story)|World Enough and Time]]'')
At [[Gosligi's Branch]], the Doctor and Bill encountered a [[Dalek harvest ship]] abducting the local children. Using his childish mindset and some creative rewiring, the Doctor disabled the ship, gifting it to the locals. ([[COMIC]]: {{cs|Harvest of the Daleks (comic story)}}) Eventually, Bill discovered a guide on how to be a [[companion]] in the TARDIS. Written by [[Clara Oswald]], the guide detailed many of the Doctor's adventures and former travelling partners, with Clara hiding it in the one place she knew a companion would find it. Bill left her own message in the text. ([[PROSE]]: {{cs|The Companion's Companion (novel)}})


[[File:Bill Cyberman.jpg|thumb|Bill realises she's a [[Cyberman (Mondas)|Cyberman]]. ([[TV]]: ''[[The Doctor Falls (TV story)|The Doctor Falls]]'')]]
After Bill got into an argument with the Doctor about the fate of the Ninth Roman Legion, they, along with a reluctant Nardole, travelled to [[2nd century]] [[Scotland]]. Bill once again got separated from the Doctor when she was chased by [[Kar]] and then encountered a [[Roman]]. She witnessed the Roman get eaten by a [[Eater of Light|mysterious creature]] and got rescued by the remaining Romans, who survived the creature's attack by running away. After being knocked unconscious for two days by the creature's slime, Bill awoke and worked with the Romans to find the Doctor. Upon being attacked by the creature again, Bill and the Romans escaped and encountered the Doctor and Nardole with the Picts. Bill and the Doctor helped the two sides work together and then worked to send the creature back through the portal where it came from. When the Doctor attempted to stay behind and guard the gate, Bill knocked him to the ground to stop him and reminded him of his duties to guard the vault on Earth. When they returned to the TARDIS, Bill and Nardole discovered that the Doctor had let Missy out of the vault for "maintenance". Despite his two companions not trusting her, the Doctor maintained the belief that Missy could change. ([[TV]]: {{cs|The Eaters of Light (TV story)}})
 
Bill and Nardole, watched over by the Doctor, became Missy's companions on a test trip to determine whether she could reform from her evil ways. While surveying the [[Colony ship (World Enough and Time)|colony ship]] they were on, Bill was mockingly called the "exposition" by Missy. Bill was mortally wounded by a paranoid technician who was the only one left of his crew, due to her being human and supposedly a target for an unknown threat. Unable to save her, the Doctor allowed her to be taken by [[Patient (World Enough and Time)|medical figures]] who had come from the lower levels of the ship as he understood were capable of healing her. He left a message in her subconscious for the moment she awoke: "wait for me". ([[TV]]: {{cs|World Enough and Time (TV story)}})


=== Cyber-conversion ===
=== Cyber-conversion ===
After several months for her, she awoke with a cybernetic heart in a hospital. Due to the spaceship's proximity to a black hole (causing time dilation within it) Bill was forced to wait a total of ten years for the Doctor and in the meantime made friends with a man named {{Simm|n=Razor}}. Razor allowed her to watch the Doctor and the others upstairs, though time passed extremely slowly; by the time the Doctor raised an eyebrow, a week passed for Bill. Razor also took her outside the hospital once, explaining how everyone had to be converted to survive given the time differential with the upper levels. Bill, wanting to be with the Doctor, began to repeatedly ask him to take her to the lifts. Eventually, Razor apparently caved in and seemingly took her to the lifts. However, he had actually taken her to the [[Conversion Theatre]], telling her that it was for her own good. She was then forcibly converted into the first Cyberman. Sometime later, the Doctor, Nardole, and [[The Master|Missy]] arrived. In the theatre, the Doctor found her, and asked her if she knew where Bill was, and told him that she ''was'' Bill, telling him, "I waited for you," as Missy, and Razor, (really the Master) took their places at her sides ([[TV]]: ''[[World Enough and Time (TV story)|World Enough and Time]]'').
[[File:Bill Cyberman.jpg|thumb|Bill realises she's a [[Cyberman]]. ([[TV]]: {{cs|The Doctor Falls (TV story)}})]]
After several months for her, she awoke with a cybernetic [[heart]] in a [[Hospital (World Enough and Time)|hospital]]. Due to the [[Colony ship (World Enough and Time)|spaceship]]'s proximity to a [[black hole]] (causing [[time dilation]] within it), Bill was forced to wait a total of ten years for the [[Twelfth Doctor]] and in the meantime made friends with a man named {{Simm|n=Razor}}. Razor allowed her to watch the Doctor and the others upstairs, though time passed extremely slowly; by the time the Doctor raised an eyebrow, a week passed for Bill. Razor also took her outside the hospital once, explaining how everyone had to be converted to survive given the time differential with the upper levels. Bill, wanting to be with the Doctor, began to repeatedly ask him to take her to the lifts. Eventually, Razor apparently caved in and seemingly took her to the lifts. However, he had actually taken her to the [[Conversion Theatre]], telling her that it was for her own good. She was then forcibly converted into the first [[Cyberman]]. Sometime later, the Doctor, [[Nardole]], and [[Missy]] arrived. In the theatre, the Doctor found her, and asked her if she knew where Bill was, and told him that she was Bill, telling him, "I waited for you," as Missy, and Razor, (really the Master) took their places at her sides. ([[TV]]: {{cs|World Enough and Time (TV story)}})
 
Bill managed to reject the Cyber programming enough to help save the Doctor from another Cyberman, destroying it, and carry him to safety after the ship Nardole piloted crashed on [[Floor 0507]], a [[solar farm]]. While staying there, she still believed she was herself, unable to understand why the villagers were scared of her. When [[Alit]] gave her a mirror, Bill realised she was in Cyber-form, causing her distress. An injured Doctor arrived and explained to her what a Cyberman was and how she was converted, speculating her mind now acted as a [[perception filter]] so she would still believe she was human. Bill, upon seeing her shadow, which confirmed she was a Cyberman, grew angry at the Doctor for not saving her, accidentally blasting a hole in the barn that further startled the villagers as they prepared for war. The Master soon arrived, informing the pair that his future self had found something of interest, momentarily teasing Bill about how he hated the ten years he had to spend with her on [[Floor 1056]]. Bill pretended that his cruelty did not upset her but was crying beneath her mask, something which surprised the Doctor.
 
While following the Master, Bill asked why the Cybermen were planning to [[Battle of Floor 0507|invade Floor 0507]], the Doctor replying that it was due to their desire to take the children. Bill questioned why the children specifically, though the Doctor withheld his reply, causing the Master to finish for him: "There is less to throw away". As the Doctor stumbled against a nearby tree, Bill began to lose hope, believing the scenario they found themselves in was inescapable- the Doctor even admitting he didn't know how he would get Bill back to normal. However, he briefly brightened Bill up by saying there was hope because she was still able to produce tears.
 
They arrived in the middle of a forest to find Missy using her [[sonic umbrella]] on a camouflaged lift. She briefly empathised with Bill's condition before calling the lift. Understanding a Cyberman would be in it, Bill ordered the others aside to combat the threat directly, the three Time Lords preparing their respective sonic devices behind her. An advanced model of Cyberman came from the lift, but the four managed to disable it after several seconds.
 
Bill later created a passageway for the children to escape in. When she went to inform Nardole of this, [[Hazran]] fired at her, believing her to be a Cyberman. This upset Bill and she went to talk to the Doctor, but before long the Cybermen arrived. The Doctor and Bill chose to remain and fight off the Cybermen despite Nardole's protests. He later bade farewell to Bill and the Doctor and was sent to defend the children.
 
[[File:Bill and Heather travels.jpg|thumb|Bill and [[Heather (The Pilot)|Heather]] begin their travels. ([[TV]]: {{cs|The Doctor Falls (TV story)}})]]
In the final battle, she was allowed to join the Doctor as he confronted the Cybermen. After the Doctor blew up Floor 0507, Bill was left alone on a battlefield. [[Heather (The Pilot)|Heather]] appeared from a puddle and Bill found herself back in her body, and saw her Cyberman shell fall to the ground, dead. After taking the Doctor back to the TARDIS, Heather explained that she traced Bill through the tears she left; and also that Bill was now like her, a [[Sentient oil|Sentient oil creature]], but she could be made human again if she wanted. Once she had left her tears with the Doctor, Bill went to travel the universe with Heather. ([[TV]]: {{cs|The Doctor Falls (TV story)}})


[[File:Bill and Heather kiss.jpg|thumb|left|Bill and [[Heather (The Pilot)|Heather]] [[kiss]]. ([[TV]]: ''[[The Doctor Falls (TV story)|The Doctor Falls]]'')]]
=== Later life ===
Bill and Heather travelled the universe together and visited all the places the Doctor never got around to showing Bill. Eventually, Bill decided she wanted to try being human again, if Heather was willing to live a human life on Earth with her. ([[PROSE]]: {{cs|Twice Upon a Time (novelisation)}}) Because of Heather's powers, Bill decided to take a break and return to [[St Luke's University]], although Heather knew that they would get back together in four months, two weeks and three days.


=== Re-united with Heather ===
During their break, Bill met another woman that she was attracted to. She was stuck in her flat due to [[COVID-19]] and remained in contact with Nardole, who had a [[space-time telegraph]] on the colony ship, although he forbade her from sharing bad news. She kept thinking that she could hear the TARDIS materialise and hoped that she would recognise him in a new [[incarnation]], telling Nardole that she would snog his face off if he were not a man. ([[WC]]: {{cs|The Best of Days (webcast)}})
Bill managed to reject the Cyber programming enough to help save the Doctor from another Cyberman, destroying it, and carry him to safety after the ship Nardole piloted crashed on [[floor 0507]], a [[solar farm]]. While staying there, she still believed she was herself, unable to understand why the villagers were scared of her. When [[Alit]] gave her a mirror, Bill realised she was in Cyber-form, causing her distress. An injured Doctor arrived and explained to her what a Cyberman was and how she was converted, speculating her mind now acted as a [[perception filter]] so she would still believe she was human. Bill, upon seeing her shadow, which confirmed she was a Cyberman, grew angry at the Doctor for not saving her, accidentally blasting a hole in the barn that further startled the villagers as they prepared for war. The Master soon arrived, informing the pair that his future self had found something of interest, momentarily teasing Bill about how he hated the ten years he had to spend with her on [[floor 1056]]. Bill pretended that his cruelty did not upset her but was crying beneath her mask, something which surprised the Doctor.


While following the Master, Bill asked why the Cybermen were planning to [[Battle of Floor 0507|invade floor 0507]], the Doctor replying that it was due to their desire to take the children. Bill questioned why them specifically, though the Doctor withheld his reply, causing the Master to finish for him: "There is less to throw away". As the Doctor stumbled against a nearby tree, Bill began to lose hope, believing the scenario they found themselves in was inescapable- the Doctor even admitting he didn't know how he would get Bill back to normal. However, he briefly brightened Bill up by saying there was hope she was still able to produce tears.
Bill and Heather purchased a home together, went clubbing, adopted cats and grew old together. Whilst dying of old age, she gave Heather permission to go back out into the universe and continue exploring. ([[PROSE]]: {{cs|Twice Upon a Time (novelisation)}})


They arrived in the middle of a forest to find Missy using her [[Sonic umbrella]] on a camouflaged lift. She briefly empathised with Bill's condition before calling the lift. Understanding a Cyberman would be in it, Bill ordered the others aside to combat the threat directly, the three Time Lords preparing their respective sonic devices behind her. An advanced model of Cyberman came from the lift, but the four managed to disable it after several seconds.
=== Undated events ===
At some point, Bill had a [[Date (activity)|date]] that was ruined by the [[Pope]]. ([[PROSE]]: {{cs|Inflicting Christmas (short story)}})


Bill later created a passageway for the children to escape in. When she went to inform Nardole of this, [[Hazran]] fired at her, believing her to be a Cyberman. This upset Bill and she went to talk to the Doctor, but before long the Cybermen arrived. The Doctor and Bill chose to remain and fight off the Cybermen despite Nardole's protests. He later bade farewell to Bill and the Doctor and was sent to defend the children.  
=== Legacy ===
Bill's [[memory|memories]] were retained by the [[Testimony Foundation]], which assumed her form as it interacted with the Doctor as well as his [[first incarnation]] and [[Archibald Hamish Lethbridge-Stewart]]. Though the Doctor, who believed Bill to have died in the [[Battle of Floor 0507]], was sceptical as to the authenticity of Bill's image, she repeatedly insisted that she was truly Bill Potts. ([[TV]]: {{cs|Twice Upon a Time (TV story)}}) As he argued with the TARDIS about regenerating, the Doctor recalled Bill suggesting to the First Doctor that "some bloke" was the answer to the Doctor's question about what was keeping evil from winning in the universe and finally understood that it was himself that she was talking about and that she was right. ([[PROSE]]: {{cs|Twice Upon a Time (novelisation)}})


[[File:Bill and Heather travels.jpg|thumb|Bill and [[Heather (The Pilot)|Heather]] begin their travels. ([[TV]]: ''[[The Doctor Falls (TV story)|The Doctor Falls]]'')]]
Bill's [[cyber-conversion]] was referenced by the [[Thirteenth Doctor]], telling her new companions [[Graham O'Brien]], [[Yasmin Khan]] and [[Ryan Sinclair]] not to follow her to confront [[Ashad]] as she refused to "lose anyone else" to the same fate. ([[TV]]: {{cs|The Haunting of Villa Diodati (TV story)}}) A short time later, Bill was one of many individuals she recalled to break free from the [[the Matrix]] on [[Gallifrey]]. ([[TV]]: {{cs|The Timeless Children (TV story)}})
In the final battle, she was allowed to join the Doctor as he confronted the Cybermen. After the Doctor blew up floor 0507, Bill was left alone on a battlefield. [[Heather (The Pilot)|Heather]] appeared from a puddle and Bill found herself back in her body, and saw her Cyberman shell fall to the ground, dead. After taking the Doctor back to the TARDIS, Heather explained that she traced Bill through the tears she left; and also that Bill was now like her, a [[Sentient oil|Sentient oil creature]], but she could be made human again if she wanted. Once she had left her tears with the Doctor, Bill went to travel the universe with Heather. ([[TV]]: ''[[The Doctor Falls (TV story)|The Doctor Falls]]'')


===Legacy===
[[The Toymaker]] would display a [[puppet]] show towards the [[Fourteenth Doctor]] and [[Donna Noble]] about the [[companion]]s he had after Donna's departure, and retold Bill's fate of being killed by the Cybermen, though the Doctor remarked that her consciousness was still alive. ([[TV]]: {{cs|The Giggle (TV story)}})
Bill's [[memory|memories]] were retained by the [[Testimony]], which assumed her form as it interacted with the Doctor as well as his [[first incarnation]] and [[Archibald Hamish Lethbridge-Stewart]]. Though the Doctor, who believed Bill to have died in the [[Battle of Floor 0507]], was sceptical as to the authenticity of the Bill's image, she repeatedly insisted that she was truly Bill Potts. ([[TV]]: ''[[Twice Upon a Time (TV story)|Twice Upon a Time]]'')


== Personality ==
== Personality ==
Bill was very smart and very inquisitive. She asked questions that most people didn’t ask and came to conclusions in a different way than other people normally did. She loved [[science fiction]] and was open to the idea that the concepts it proposed were real and affected the lives of those around her. When [[Heather (The Pilot)|Heather]] introduced her to [[sentient oil|a strange puddle]], she was open to the idea of [[alien]] [[lizard]] [[mind control|possession]], no matter how preposterous the [[Twelfth Doctor]] found it. She was also easily able to figure out that the Doctor intended to wipe her memory when he tried to put her hands on her head, and even called out the Doctor for thinking she was stupid enough to fall for it. ([[TV]]: ''[[The Pilot (TV story)|The Pilot]]'')
Bill was very smart and inquisitive. She asked questions that most people didn’t ask, and admitted that "Questions [were] kind of [her] thing", ([[TV]]: {{cs|Twice Upon a Time (TV story)}}) and came to conclusions in a different way than other people normally did. She loved [[science fiction]] and was open to the idea that the concepts it proposed were real and affected the lives of those around her. When [[Heather (The Pilot)|Heather]] introduced her to [[sentient oil|a strange puddle]], she was open to the idea of [[alien]] [[lizard]] [[mind control|possession]], no matter how preposterous the [[Twelfth Doctor]] found it. She was also easily able to figure out that the Doctor intended to wipe her memory when he tried to put his hands on her head, and even called out the Doctor for thinking she was stupid enough to fall for it. ([[TV]]: {{cs|The Pilot (TV story)}})
 
Bill's relationship with [[Moira (The Pilot)|Moira]] tended to be similar to roommates rather than mother and daughter. Backing this up is that Bill tried to keep out of Moira's personal life by never remembering her partner's names; Bill hinted that she actually got along well with some of them. ([[TV]]: {{cs|The Pilot (TV story)}})
 
Bill was also rather bold. When [[Sutcliffe|Lord Sutcliffe]] demanded she submit to him because of her gender and race, Bill merely sneered at him. ([[TV]]: {{cs|Thin Ice (TV story)}}) She further showed bravery; willingly entering the bathroom to face what was hiding in there and confronting the [[sentient oil]], ([[TV]]: {{cs|The Pilot (TV story)}}) leading her group of flatmates when they were scared, ([[TV]]: {{cs|Knock Knock (TV story)}}) speaking with [[Ice Queen]] [[Iraxxa]] of Mars even though she'd seen how dangerous [[Ice Warrior]]s can be, ([[TV]]: {{cs|Empress of Mars (TV story)}}) and staying to combat the army of [[CyberMondan|Early Cybermen]] as well as [[Cyber Legion|Legion Cybermen]] and [[Weapons-grade Cyberman|Weapons-Grade Cybermen]] despite knowing full well she would die in the conflict. ([[TV]]: {{cs|The Doctor Falls (TV story)}})
 
Bill also learned to understand the need to not dwell on matters that angered her as the Doctor taught her there simply wasn't time to waste on such matters. ([[TV]]: {{cs|Thin Ice (TV story)}}) Her [[optimism]] kept her from breaking and preserved hope she'd meet her Doctor again. ([[TV]]: {{cs|The Doctor Falls (TV story)}})


Bill was also rather bold, hating the idea of being spoken to in a sexist manner and having to withhold her opinion due to racial stereotypes of the 19th century. When [[Sutcliffe|Lord Sutcliffe]] demanded she submit to him, Bill merely sneered at him. She also learned to understand the need to not dwell on matters that angered her as the Doctor taught her there simply wasn't time to waste on such matters. ([[TV]]: ''[[Thin Ice (TV story)|Thin Ice]]'')
Bill was also more prone to profanity than many of the Doctor's other companions. She was implied to have sworn on multiple occasions, ([[TV]]: {{cs|Thin Ice (TV story)}}, {{cs|The Lie of the Land (TV story)}}) and also once called the Twelfth Doctor a "bloody arse", much to the objection of his [[First Doctor|first]] incarnation who threatened to smack her bottom if she swore again. ([[TV]]: {{cs|Twice Upon a Time (TV story)}})


Bill was [[homosexuality|interested in girls]]. ([[TV]]: ''[[Knock Knock (TV story)|Knock Knock]]'') She had a [[crush]] on a girl who attended the Doctor's lectures, and developed an interest in another young woman, [[Heather (The Pilot)|Heather]]. ([[TV]]: ''[[The Pilot (TV story)|The Pilot]]'')  
Bill was a [[lesbian]]. ([[TV]]: {{cs|Knock Knock (TV story)}}) She had a [[crush]] on a girl who attended the Doctor's lectures, and developed an interest in another young woman, [[Heather (The Pilot)|Heather]]. ([[TV]]: {{cs|The Pilot (TV story)}})


Despite having never met her mother, Bill invented an imaginary version of her which she spoke to for personal comfort. ([[TV]]: ''[[Oxygen (TV story)|Oxygen]]'', ''[[The Lie of the Land]]'') According to Bill, this version always told her "with some people you can smell the wind in their clothes", a saying Bill made up based on what she thought her mother would say. ([[TV]]: ''[[The Pilot (TV story)|The Pilot]]'')  
Despite having never met her mother, Bill invented an imaginary version of her which she spoke to for personal comfort. ([[TV]]: {{cs|Oxygen (TV story)}}, {{cs|The Lie of the Land (TV story)}}) According to Bill, this version always told her "with some people you can smell the wind in their clothes", a saying Bill made up based on what she thought her mother would say. ([[TV]]: {{cs|The Pilot (TV story)}})


== Skills ==
== Skills ==
Bill was extremely bright and quick witted, able to perform well in the Doctor's university assessments with his private tuition in the field of science, getting a First in every assignment, and impressed him enough before hand that he saw potential in her. She was also able to deduce complex puzzles with only some prompting from the Doctor, notably that the puddle in the ground was not reflecting as a mirror and that the damaged cement was actually scorch marks of the ships, ([[TV]]: ''[[The Pilot (TV story)|The Pilot]]'') and that the lights, which she perceptively noticed, under the ice in the Thames were organic rather than artificial. ([[TV]]: ''[[Thin Ice (TV story)|Thin Ice]]'') Bill also deduced the TARDIS granted her the ability to speak different languages, ([[TV]]: ''[[The Eaters of Light (TV story)|The Eaters of Light]]'') and that the patients in the hospital were in severe pain despite [[The Master#As_Harold_Saxon|"Razor"]] trying to convince her otherwise. ([[TV]]: ''[[World Enough and Time (TV story)|World Enough and Time]]'')
Bill was extremely bright and quick-witted, able to perform well in the Doctor's university assessments with his tuition in the field of science, getting a First in every assignment, and impressed him enough beforehand that he saw potential in her. She was also able to deduce complex puzzles with only some prompting from the Doctor, notably that the puddle in the ground was not reflecting as a mirror and that the damaged cement was actually scorch marks of the ships, ([[TV]]: {{cs|The Pilot (TV story)}}) and that the lights, which she perceptively noticed, under the ice in the Thames were organic rather than artificial. ([[TV]]: {{cs|Thin Ice (TV story)}}) Bill also deduced the TARDIS granted her the ability to speak different languages, ([[TV]]: {{cs|The Eaters of Light (TV story)}}) and that the patients in the hospital were in severe pain despite "{{Simm|n=Razor}}" trying to convince her otherwise. ([[TV]]: {{cs|World Enough and Time (TV story)}})


She could even notice things the Doctor overlooked, such as the strangeness that a grown man would root through grass and trees for [[Dryads|bugs]], or that he wasn't old enough for the Doctor's theory to make sense. She was also rather brave, leading her group of flat mates when they were scared. ([[TV]]: ''[[Knock Knock (TV story)|Knock Knock]]'') She further displayed bravery as she volunteered to combat the oncoming Cyberman from floor 1056 in her cyber form despite the Doctor implying its technology would be more formidable than her own, and stayed to combat the army of multiple fully evolved Cybermen despite knowing full well she would die in the conflict. ([[TV]]: ''[[The Doctor Falls (TV story)|The Doctor Falls]]'') She was also brave when confronting the sentient oil, who she thought was an intruder, willingly entering the bathroom to face what was hiding in there. ([[TV]]: ''[[The Pilot (TV story)|The Pilot]]'')
She could even notice things the Doctor overlooked, such as the strangeness that a grown man would root through grass and trees for [[Dryad|bugs]], or that he wasn't old enough for the Doctor's theory to make sense.


When transformed into a Cyberman, she managed to retain her free will despite being fitted with an emotional inhibitor. The upgrade prolonged her lifespan (though it slowed her down to mere walking speed) and also gave her a cybernetic blaster on the handlebars on her headpiece. Using said blaster by channelling anger, she could blast a gaping hole in a barn and a concrete wall, incinerate another Mondasian Cyberman and could combine with the Master's modified [[laser screwdriver]] to disable a fully evolved Cyberman. The upgrade made her resistant to bullets, even when hit at close range. She also retained the ability to cry, a gift her romantically involved classmate Heather granted her to be able to find her. ([[TV]]: ''[[The Doctor Falls (TV story)|The Doctor Falls]]'')
She also possessed a strong will power. When the Monks took over Earth, Bill was able to maintain her memory of the Doctor and the world before their rule by using her imaginary image of her mother. ([[TV]]: {{cs|The Lie of the Land (TV story)}}) When transformed into a Cyberman, she managed to retain her free will despite being fitted with an emotional inhibitor. ([[TV]]: {{cs|World Enough and Time (TV story)}}) The upgrade prolonged her lifespan (though it slowed her down to mere walking speed) and also gave her a cybernetic blaster on the handlebars on her headpiece. Using said blaster by channelling anger, she could blast a gaping hole in a barn and a concrete wall, incinerate another Mondasian Cyberman and could combine with the Master's modified [[laser screwdriver]] to disable a fully evolved Cyberman. The upgrade made her resistant to bullets, even when hit at close range. She also retained the ability to cry, a gift her romantically involved classmate Heather granted her to be able to find her. ([[TV]]: {{cs|The Doctor Falls (TV story)}})


== Appearance ==
== Appearance ==
Bill was a young black woman with an afro, worn in a variety of styles. ([[TV]]: ''[[The Pilot (TV story)|The Pilot]]'', et al.) According to the Doctor's [[sonic sunglasses]], Bill was female, was 26 years old by the time of [[the Monks]]' invasion, weighed 130.2 [[pound]]s, and measured 167.7 cm in [[height]]. ([[TV]]: ''[[The Pyramid at the End of the World (TV story)|The Pyramid at the End of the World]]'')
Bill was a young black woman with an afro, worn in a variety of styles. ([[TV]]: {{cs|The Pilot (TV story)}}, etc.) According to the Doctor's [[sonic sunglasses]], Bill was female, was 26 years old by the time of the [[Monk (species)|Monks]]' invasion, weighed 130.2 [[pound]]s, and measured 167.7 [[centimetre|cm]] in [[height]]. ([[TV]]: {{cs|The Pyramid at the End of the World (TV story)}})
 
She didn't like her face because it was "always doing expressions [when she was] trying to be enigmatic". ([[TV]]: ''[[The Pilot (TV story)|The Pilot]]'')
 
[[File:The Doctor Falls Cyberman Mirror.jpg|thumb|Bill's appearance as a Cyberman. ([[TV]]: ''[[The Doctor Falls (TV story)|The Doctor Falls]]'')]]


When mortally wounded by [[Jorj]], she was partially cyber converted, given a cybernetic chest-unit. While on the colony ship, she aged, her hair becoming generally messier and less profound. ([[TV]]: ''[[World Enough and Time (TV story)|World Enough and Time]]'') She was also eventually converted into a [[Cyberman (Mondas)|Cyberman]], subsequently looking like one, though she still inwardly perceived herself as looking human. ([[TV]]: ''[[The Doctor Falls (TV story)|The Doctor Falls]]'')
She had problems with her [[face]] because it was "always doing [[expression]]s [when she was] trying to be enigmatic". ([[TV]]: {{cs|The Pilot (TV story)}})


== Aliases and nicknames ==
[[File:The Doctor Falls Cyberman Mirror.jpg|thumb|Bill's appearance as a Cyberman. ([[TV]]: {{cs|The Doctor Falls (TV story)}})]]
{| class="wikitable"
When mortally wounded by [[Jorj]], she was partially [[cyber-conversion|cyber-converted]], given a cybernetic chest-unit. While on the [[Colony ship (World Enough and Time)|colony ship]], she aged, her [[hair]] becoming generally messier and less profound. ([[TV]]: {{cs|World Enough and Time (TV story)}}) She was also eventually converted into a [[CyberMondan|Mondasian Cyberman]], subsequently looking like one, though she still inwardly perceived herself as looking [[human]]. ([[TV]]: {{cs|The Doctor Falls (TV story)}})
|-
! width="15%" |Name
! width="40%" |When used/given
! width="15%" |Story
! Etymology
|-
|Thing One
|Given by Missy while pretending to be "[[Aliases of the Master|Doctor Who]]".
|''[[World Enough and Time (TV story)|World Enough and Time]]''
|'''Behind the scenes: '''a reference to the story 'The Cat in the Hat' and the Cat's helpers, Thing One and Thing Two
|-
|Exposition
|Given by Missy while pretending to be "Doctor Who".
|''[[World Enough and Time (TV story)|World Enough and Time]]''
|'''Behind the scenes:''' a stock character-type in literature.
|-
|RoboMop
|Given by {{Simm}} after Bill was upgraded into a Cyberman.
|''[[The Doctor Falls (TV story)|The Doctor Falls]]''
|'''Behind the Scenes: '''A reference to both the character Robocop, who like Bill was fatally injured and turned into a cyborg, and to Bill's hair. 
|}


== Behind the scenes ==
== Behind the scenes ==
[[File:Bill's Theme - DWFinaleCountdown - Doctor Who|thumb|[[Bill's Theme]] performed by the [[BBC National Orchestra of Wales]].]]
[[File:Bill's Theme - DWFinaleCountdown - Doctor Who|thumb|[[Bill's Theme]] performed by the [[BBC National Orchestra of Wales]].]]
=== Doctor Who The Official Annual 2018 ===
=== Doctor Who The Official Annual 2018 ===
According the ''[[Doctor Who The Official Annual 2018]]'', which is not accepted as a [[Tardis:Valid sources|valid source for in-universe articles on this wiki]], Bill started sneaking into the Doctor's lectures when she overheard the other students talking about how the Doctor "knew everything about everything" and wanted to know something herself.
According to the ''[[Doctor Who The Official Annual 2018]]'', which is not accepted as a [[Tardis:Valid sources|valid source for in-universe articles on this wiki]], Bill started sneaking into the Doctor's lectures when she overheard the other students talking about how the Doctor "knew everything about everything" and wanted to know something herself.


=== Other matters ===
=== Other matters ===
Bill Potts shares her name with [[William Hartnell]], who was often known as Bill or Billy, while Bill's first [[Heather (The Pilot)|love interest]] shares her name with his wife [[Heather Hartnell|Heather]]. She also shares the name with [[Billie Piper]] who played [[Rose Tyler]], a companion to the [[Ninth Doctor|Ninth]] and [[Tenth Doctor]]s, as well as [[the Moment]].
Bill Potts shares her name with First Doctor actor [[William Hartnell]], who was often known as Bill or Billy, while Bill's first [[Heather (The Pilot)|love interest]] shares her name with his wife [[Heather Hartnell|Heather]]. She also shares the name with [[Billie Piper]] who played [[Rose Tyler]], a companion to the [[Ninth Doctor|Ninth]] and [[Tenth Doctor]]s, as well as [[the Moment]].


== External links ==
== External links ==
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{{Companions of the Twelfth Doctor}}
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Latest revision as of 18:18, 3 November 2024

Bill Potts
Gallery
Appearances
You may be looking for the Shadow World version of Bill.

Bill Potts was the final companion of the Twelfth Doctor. She shared a teacher-student relationship with him similar to that of Leela and Gabby Gonzalez, albeit on more official circumstances.

When she first encountered the Doctor, Bill was working as a canteen assistant at St Luke's University, seemingly destined for an unprivileged life. When free from work, she attended some of the Doctor's physics lectures at the university. The Doctor saw her unfulfilled potential and invited her for a series of personal tutoring sessions.

Following an encounter with a time-travelling puddle that was piloted by her new crush, Heather, Bill discovered who the Doctor really was — an alien time-traveller, guarding a secret vault beneath the university campus. The Doctor later invited her to join him on a journey through space and time.

On her adventures with the Doctor and Nardole, Bill travelled to a human colony planet and visited the last of the great frost fairs. She faced the vacuum of space and saved the Earth using the memory of her mother. She also learned that the Doctor was trying to rehabilitate his old Time Lady friend Missy. Bill also helped restore the Doctor's lost eyesight in exchange for temporarily helping aliens take over the Earth.

When accompanying the Doctor on his test to see if Missy could be good, she was fatally shot on a Mondasian ship by Jorj. She was then converted into a Cyberman against her will, though she retained her sense of self thanks to her strong will.

After helping the Doctor destroy the Cybermen, Bill was rescued from her fate by Heather, who had returned for her and converted Bill into a sentient oil being like herself. After setting the TARDIS to take the Doctor away, Bill left with Heather to explore the universe.

Biography[[edit] | [edit source]]

Early life[[edit] | [edit source]]

Bill was born around 1991. (TV: The Pyramid at the End of the World [+]Loading...["The Pyramid at the End of the World (TV story)"]) Her mother died when she was young, so she was brought up by a foster mother called Moira. (TV: The Pilot [+]Loading...["The Pilot (TV story)"]) Bill did not openly express her sexuality, preferring to only reveal it when required. Her adoptive mother was oblivious to her being a lesbian, assuming that Bill was interested in men. (TV: The Pilot [+]Loading...["The Pilot (TV story)"], Extremis [+]Loading...["Extremis (TV story)"]) As Moira was never able to hold down a single partner, Bill tended to never bother learning their names as "[she'd] only get attached." (TV: The Pilot [+]Loading...["The Pilot (TV story)"])

At St Luke's University[[edit] | [edit source]]

Later in life, Bill served chips at St Luke's University in Bristol, and — despite not being a student — attended some of the Twelfth Doctor's lectures. Noticing her potential, he became her personal tutor. Bill also accidentally fattened up a girl she fancied by giving her extra chips; though she lost interest in the girl, Bill continued to give her extra chips as a gesture of kindness.

Bill cries while looking at her mother's pictures. (TV: The Pilot [+]Loading...["The Pilot (TV story)"])

During Christmas 2016, Bill mentioned to the Doctor that she was "supposed to look" like her mother, but, as her mum rarely had any pictures taken, Bill didn't really know if she looked like her. When she went to the flat where she lived with her mother, Moira told her she had found a box with pictures of Bill's mum. On one of the photos, Bill could see the Doctor's reflection.

Over the course of her tutoring in 2017, Bill developed a crush on another student, Heather, who showed her a puddle that cast a reversed reflection. Bill asked Heather not to leave without her. As a result, when Heather was taken over by the puddle, she followed Bill home, so as not to leave without her.

Bill went to the Doctor's office, and then he brought her into the TARDIS. He tried to outrun the water creature, at first travelling to Sydney, Australia, then to a faraway planet, and, finally, a war zone in the Dalek-Movellan War. Bill realised she was being pursued as Heather had promised not to leave without her. On the Doctor's advice, she released Heather from her promise.

The Doctor took her back to the university, where Bill expressed regret at having turned down Heather's offer, with the Doctor telling her it was unlikely they would ever see each other again. When Bill knowingly looked at the TARDIS, the Doctor realised what she was suggesting and made her stand close to him, intending to wipe her memory of these events, but she convinced him not to. He then agreed to take Bill with him on his travels, acknowledging that they might run into Heather one day. (TV: The Pilot [+]Loading...["The Pilot (TV story)"])

Travels with the Doctor[[edit] | [edit source]]

Bill explores a human colony. (TV: Smile [+]Loading...["Smile (TV story)"])

The Doctor took Bill to visit a human colony in the far future, telling Nardole that he was just transporting the TARDIS back to the office. When the Doctor discovered the Vardy robots had killed the set-up team on the colony, the pair almost blew up the ship around which the city had been built before realising that the colonists had already arrived and were in hibernation. The Doctor stopped the bomb, and the pair deduced that the Vardies had been built to sustain happiness and had come to view grief as a plague.

The Doctor rebooted the Vardies, erasing their memories of the humans, before beginning diplomatic negotiations between the humans and Vardies. He then tried to return to the university just after they left, but when he and Bill exited the TARDIS, they discovered they were outside in winter with an elephant in front of them. (TV: Smile [+]Loading...["Smile (TV story)"])

On exploring London in 1814, the Doctor and Bill attended the last Frost Fair on the River Thames before noticing strange lights under the ice. Bill witnessed firsthand the death of a little boy when he was sucked under the ice and was horrified and disgusted when the Doctor seemed to care more about retrieving his sonic screwdriver than the boy who had been stolen. Bill challenged the Doctor demanding to know whether he had ever killed anyone to which he confirmed saying that he did not have the luxury for outrage as he was 2000 years old. Bill befriended the urchins who had originally stolen from them and chose to cooperate with the Doctor. Their investigation led them to Lord Sutcliffe with the Doctor warning Bill to let him do the talking as it required a diplomatic approach. After Sutcliffe made racist remarks towards Bill, however, the Doctor punched him in the face. Later Bill agreed with the Doctor to set the creature in the Thames free, surprised when it wasn't headline news in the present day. (TV: Thin Ice [+]Loading...["Thin Ice (TV story)"])

Bill meets Rudy Zoom. (COMIC: The Soul Garden [+]Loading...["The Soul Garden (comic story)"])

The Doctor took Bill to Titan to see a clear image of Saturn, her favourite planet. He then introduced her to the concept of "swimming" in the gravity-deprived atmosphere, although this was cut short when the area around them was heavily disturbed by a passing land ship. When the pair were rescued by the passing vehicle, Bill was introduced to Rudy Zoom, the financier of the voyage. The two soon met Lady Takashi, a psychic who felt an alien presence on Titan years ago in a sleep. The ship changed its buoyancy to float on the methane river. After several hours, they found a domed-off garden in a cavern, which they investigated on foot. The Doctor noticed that all of the vegetation inside was sentient, except for two trees in the centre. The group was scattered when a robot attacked them, believing them to be weeds. As Bill hid in the garden, she was attacked by one of the Haluu plants and passed out. Bill found herself in the Dreamspace where Sythorr — who was the giant Haluu below the two trees — chased Bill and Rudy in an attempt to wipe their minds as part of his plan to take over Earth. They escaped and projected themselves into the real world until they woke up. Sythorr's lover Oksanna ordered Bill and Rudy to be released. As they ran for the doors, Oksanna sacrificed her life to destroy Sythorr and the domed garden. After making it to the ship, Bill saw the last piece of Sythorr warn the Doctor before dying that "The unknown soldier...is stirring." (COMIC: The Soul Garden [+]Loading...["The Soul Garden (comic story)"])

The Doctor and Bill landed in the Indian Territory in 1880, where the outlaw Seth Shelton tried to hold Bill hostage. She was saved by United States Deputy Marshal Bass Reeves and the scout Joey Two Trees, who had Shelton arrested and intended to take him back to Arkansas to stand trial. While Reeves, Joey and the Doctor took off, Seth's brother Frank Shelton arrived at Reeves' wagon and freed Seth. Seth and Frank waited for the Doctor and his friends to return so they could kill them. The Seminole medicine woman Totika summoned the Stikini who killed the Sheltons by ripping their hearts from their bodies. The Stikini threatened the life of Zeke Tolbert, but Bill promised to tell Totika the truth about Bill's travels to other worlds. Totika then put Bill to the test to swap her body with Stikini War-Queen Cocheta in the Red Skies, a region of the Dreamspace the Stikini were native to. The Doctor and Reeves freed Bill during the ceremony, but the ceremony succeeded. In the Red Skies, Bill met the other Seminole Totika had banished. The Doctor contacted Bill, telling her where she was. Bill and the Seminole willed themselves out of the Red Skies, forcing the Stikini back there. Reeves and Joey destroyed the totem used in Totika's ceremonies. Afterwards, the sky opened up, and the group saw the Stikini get burnt by an unknown force in the Red Skies. Returning to the TARDIS, the Doctor and Bill saw the TARDIS had impossible carvings on its exterior, and the Doctor demanded answers. (COMIC: The Parliament of Fear [+]Loading...["The Parliament of Fear (comic story)"])

Searching for answers about the carving on the TARDIS, the Doctor came to the Renath Archive library on Cornucopia to try to identify it. Angered by the head librarian Matildus Galathea's snobiness, Bill went outside to the Kaballus Quarter for some fresh air. Noticing Bill was the first to come in or out of the library in months, the Kaballus Kids captured Bill, and told her that Matildus used to let them hang around before she behaved strangely and barred the kids. Bill showed them a photo of Matildus being grumpy, which revealed something strange around her head.

Returning to the library with the Kaballus Kids, Bill told the Doctor, Matildus and Sashana to stop whatever it was they were doing. Bill took a photograph on her phone which revealed Sashana's true form. Sashana revealed that she was psychically sowing doubt in Matildus' mind and blocking her memories so Sashana could sell off the library's collection after being handed custody of it. She began to fry the group's brains with her mind, but was stopped after Bill summoned the Ristallian crater-hound Archie, whose simple brain couldn't be kept back. After Sashana was arrested, the Doctor realised the carving wasn't a symbol, but a coded message. The Doctor and Bill's next destination to break the code was to see Alan Turing. (COMIC: Matildus [+]Loading...["Matildus (comic story)"])

The Doctor and Bill went to visit the Galatean duplicate of Alan Turing on the lunar colony Athenia to decipher the markings on the TARDIS. However, Alan had vanished two years previously. The Galatean Chiyoko, feeling her "mother" (the TARDIS's essence on Bill), had Bill take Chiyoko to the TARDIS, which Chiyoko could hear was screaming due to the markings on the TARDIS's shell. After reuniting with the Doctor, Chiyoko told him where to find Alan. They found Alan inside a replica of King's College, Cambridge on the Moon's surface. The arrival of the TARDIS caused the code, which was part of the Dreamspace-dwelling Phantom Piper, to make the Piper manifest through Alan using Block Transfer Computation. When the Phantom Piper used Chiyoko's mind to create soldiers from every war to start a war between humans and Galateans. Bill told Maggie Cortez not to kill Chiyoko, and told Maggie to trust the Doctor. With the help of a suggestion from the Doctor, Alan defeated the Piper by breaking down his code, allowing Chiyoko to live. (COMIC: The Phantom Piper [+]Loading...["The Phantom Piper (comic story)"])

Shortly afterwards, the Doctor and Bill ended up stranded in an entropy bubble in space, as part of an elaborate trap by Fey Truscott-Sade to capture time travellers, including the Doctor. During an attack by the Clockwise Men, Bill helped Gol Clutha attack them with a proton cannon, but was powerless to stop them ageing Gol to death. Escaping, the Doctor and Bill landed back on Cornucopia, where Bill shouted at him for not telling her enough about what was going on. After apologising and meeting Annabel Lake, Bill narrowly avoided being shot at by Fey during their flight to Wonderland HQ, leaving her shaken for being targeted instead of the Doctor.

After the Doctor explained to Bill his past with Fey during the Time War, they met with Matildus, where Bill watched over the Doctor as he fell asleep to meet Fey in the Dreamspace. Later, when it was discovered that Fey's only surviving relative, Alexander Truscott, was probably behind things, Bill recognised him from his appearances on TV. After she and the Doctor got captured in an attempt to storm Truscott's house, they eventually escaped, where Bill first noticed the globes from London's CCTV cameras floating and forming around Fey, preparing to attack. The globes reconstituted as Shayde around Fey, and Bill joined the Doctor's group in entering the Dreamspace inside. After Fey attacked the Doctor, Bill finally got her to listen by explaining how the Doctor always tries to do what is right, allowing the Doctor to reveal the truth to her: that the Absence was never real. After the revived Shayde wiped Fey's memory of her time with him at the cost of his own life, Bill joined the Doctor in placing her safely in Wonderland in London, although she was upset that the Doctor never said goodbye to her. (COMIC: The Clockwise War [+]Loading...["The Clockwise War (comic story)"])

She later helped investigate and stop the Shining Men, (PROSE: The Shining Man [+]Loading...["The Shining Man (novel)"]) and visited Kollo-Zarnista Mining Facility 27 above Saturn. (PROSE: Diamond Dogs [+]Loading...["Diamond Dogs (novel)"])

Bill and five other university students were looking for accommodation when the Landlord invited them to stay in 11 Cardinal Road. The Doctor also investigated and discovered the Landlord was feeding students to the Dryads, insects who were working with the Landlord to keep his mother Eliza alive. Bill led her own investigation and discovered the secret of the house. After the Landlord was defeated, the house disintegrated. (TV: Knock Knock [+]Loading...["Knock Knock (TV story)"]) She later moved back in with her foster mother. (TV: Extremis [+]Loading...["Extremis (TV story)"])

While travelling, the TARDIS was drawn to the 9th century, in the Northern reaches of the Atlantic Ocean. Allying with a group of Vikings, the Doctor and Bill discovered a group of Ice Warriors attempting to contain The Flood. Though the Doctor initially attempted to parlay with the Flood, he soon realised that they were caught in a time loop relating to his adversary Fenric. Having Bill evacuate the Ice Warriors, the Doctor detonated a volcano to destroy the Flood strain, before evacuating everyone. (COMIC: The Wolves of Winter [+]Loading...["The Wolves of Winter (comic story)"])

Bill later bore witness to the Doctor bringing peace to a planet populated by clones of his old friend Plex. He later told her the true story of how the clones' society came to be. (COMIC: The Promise [+]Loading...["The Promise (FCBD comic story)"])

When preparing for a date, Bill had her identity stolen by an Ohcho named Ziggy, the Doctor dismissing her when she tried to get his help. Recruiting Lou, Bill managed to convince the Doctor of both her identity and to help Ziggy return home. (PROSE: Bill and the Three Jackets [+]Loading...["Bill and the Three Jackets (short story)"])

When a temporal crisis rendered TARDIS travel all but impossible, the Twelfth Doctor became stranded on Gallifrey with Bill Potts. There, he acquired a stash of Kyfred Gems and came up with the idea of using them to stabilise the temporal energy by throwing them into the Untempered Schism "like skipping stones". Bill accompanied the Doctor to the Schism, but had to wear a protective shield to avoid the sight of the Schism "melting her brain". They then split up with Bill returning to the Panopticon, where she was confronted with Nardole — much to her surprise, as she hadn't previously realised that he'd hitched a ride on this particular TARDIS trip. (GAME: Lost in Time [+]Loading...["Lost in Time (video game)"])

Travels with the Doctor and Nardole[[edit] | [edit source]]

Bill is exposed to the vacuum of space. (TV: Oxygen [+]Loading...["Oxygen (TV story)"])

Bill visited the mining station named Chasm Forge after the TARDIS received a distress call from it. As oxygen was regulated and the TARDIS exterior air shell was being removed, Bill had to wear a smartsuit that provided her with a force field which held air in. When entering an airlock which required a solid physical helmet, Bill's malfunctioning suit automatically took her helmet off. This meant Bill was exposed to the vacuum of space. The Doctor later gave her his helmet, at the cost of his sight. (TV: Oxygen [+]Loading...["Oxygen (TV story)"])

After viewing an email from his virtual counterpart, the Doctor called Bill asking if she knew a person called Penny. Bill did, but deemed her "out of [her] league". The Doctor assured her she wasn't and told her to call Penny that night as he had a "feeling [they were] going to be very busy". (TV: Extremis [+]Loading...["Extremis (TV story)"])

Bill went on a date with Penny and told her about the virtual world the Doctor had since told her about. Penny was disbelieving, but the date was going well until armed soldiers and the Secretary-General of the UN arrived to collect Bill and take her to see a pyramid that had appeared overnight. On board the Doctor's President plane, Bill tried to convince the Doctor in the TARDIS to come and help with the pyramid - but he denied until he realised he didn't have a choice as the TARDIS had already been loaded onto the plane.

At the pyramid, Bill was confused when Nardole was 'updating' the Doctor on what was happening in front of them as the latter approached the pyramid. Her phone, like every other device with a clock, received a message saying 23:57 pm as the Monks started a countdown to the end of the Earth, demanding surrender. The Doctor, Bill and Nardole then took the Heads of the American, Russian and Chinese armies and had them strike the pyramid in a coordinated attack.

The Monks stopped the attacks with ease and expressed they were ready to talk. Inside, the Monks revealed that Earth would be dead in a year's time if the planet did not consent to the Monks' help.

The Doctor was against consenting to something he didn't understand, though Bill and the others were more willing. However, the Monks explained that love was needed in consent, burning the Secretary-General when he consented out of fear.

Back on board the President plane, the army heads agreed not to fight one another believing that they would be stopping World War III, but this failed to revert the clocks. Bill compared the need for consent as to inviting vampires into a person's home. She also theorised a bacterial possibility and the Doctor had them all Google possible problems. However, Bill and the army heads were considering surrendering Earth to ensure the planet survived, unwilling to put such risk especially when the clocks moved to 23:58 pm.

As the Doctor and Nardole deduced the problem as a biological component released in a lab, Bill and the army leaders went to the Pyramid as the countdown reached 23:59pm. Inside, the army leaders were burned by the Monks for consenting out of strategy. Bill went to leave when the Doctor managed to solve the biological problem and the countdown began to go backwards. However, when the Doctor could not leave due to being blind and unable to spin the combination lock, Bill returned and consented to the Monks having authority over the Doctor in return for his sight being restored. Before the Monks accepted her 'pure' consent out of love, she told the Doctor to save her planet. (TV: The Pyramid at the End of the World [+]Loading...["The Pyramid at the End of the World (TV story)"])

Bill was reunited with Nardole during the Monks' reign over Earth. She had been away from Nardole and the Doctor for six months since their last adventure. The Monks had inserted themselves into history during this time, however, Bill had refused to fall for the mental deception.

Nardole located Bill and helped her find the prison hulk where he believed the Doctor was making his broadcasts and was captive there. The Doctor told Bill he was cooperating willingly with the Monks, believing that humanity was doomed without their guidance. Bill became distraught and shot the Doctor with a gun she took from one of the SWAT troops, who appeared to begin regenerating, but quickly stopped. The entire scenario was revealed to have been a test by Nardole, the Doctor and the team, to make sure Bill was not under the influence of the Monks.

At the university where the Doctor and Bill worked, they entered the Vault to talk to Missy, who said she had encountered the Monks before. She confirmed the Monks maintained control by broadcasting a signal containing the false history to their subjugated victims via the numerous statues they had built across Earth, enabled by a psychic link established through the person who originally gave "consent"; Missy claimed to have defeated them during her own encounter by killing that individual. She implied that Bill must die as the one who gave consent on Earth.

Bill accepted her fate, but the Doctor was determined for another solution. Along with Nardole and the SWAT troops, they infiltrated the Monks' pyramid in London so that the Doctor could hijack their broadcast with his own mind to break the psychic transmission. In the central chamber, the Doctor attempted to link his mind to the controlling Monk, who after a struggle overpowered the Doctor. Bill intended to sacrifice herself, linking her own mind to the Monk's despite the Doctor's protests. The Monks' broadcast was replaced with images of Bill's mother, which the Doctor recognised as a strong and loving memory in Bill's mind. Humanity woke up from the Monks' lies and revolted against them. The Doctor, Bill, and Nardole watched as the Monks abandoned Earth. Sometime later, the Doctor and Bill found that most of humanity had no recollection of the Monks. (TV: The Lie of the Land [+]Loading...["The Lie of the Land (TV story)"])

When the Doctor was "correcting" the books of the Terrance Dicks Library, the building was demolished by a bowship piloted by the Doctor's daughter, Jenny. After Jenny had explained the events that led to her arrival, Bill was ready to help only to be shocked by the white energy that emanated from the Void, finding she was immune to it. As "possessed" UNIT forces arrived and starting advancing menacingly, the Doctor ushered everyone into the TARDIS only to find it had been merged with that of his tenth incarnation, with the Eighth and Ninth Doctors soon arriving. The Doctors managed to trace and neutralise the malignant energy but doing so left only the Twelfth Doctor with any memories of what had happened, him happily taking Bill and Nardole away to tell them what had just happened. (COMIC: The Lost Dimension [+]Loading...["The Lost Dimension (comic story)"])

With Nardole joining the Doctor and Bill on off-world adventures, the trio visited NASA and discovered the phrase "God Save the Queen" on the surface of Mars. The trio arrived on Mars in 1881 and Bill became separated from the Doctor when she fell down a hole, causing Nardole to return to the TARDIS and get stuck there when the TARDIS returned to Earth. The Doctor and Bill reunited and discovered an Ice Warrior called Friday working with a group of Victorian soldiers. The Doctor and Bill pretended to be from the police. After the Empress was awoken, Bill and the Doctor were locked up by Captain Catchlove, who wanted Mars for himself. Friday rescued them and Bill attempted to prevent an all-out war between the Ice Warriors and the humans. When the crisis was resolved, the TARDIS returned and Bill learnt that Missy had been let out of the Vault by Nardole to rescue them. (TV: Empress of Mars [+]Loading...["Empress of Mars (TV story)"])

Bill, the Doctor and Nardole travelled to Edinburgh in 1645, where they encountered a city plagued by Ghosts and the actual Plague. (PROSE: Plague City [+]Loading...["Plague City (novel)"])

When the Vault needed a new Relative Dimensional Stabiliser, the Doctor took Bill and Nardole to Übermarket where Bill helped a lost Pathicol child called Tyto find her parents. (COMIC: The Great Shopping Bill [+]Loading...["The Great Shopping Bill (comic story)"])

When the Doctor was drawn to the inactive Jeden, Bill encountered the Heavenly Hosts. As the ship became more dangerous, the Doctor instructed Bill to return to the TARDIS and activate Emergency Protocol 13-9 which granted Missy remote control of the TARDIS. As the ship dematrialised, Bill saw a sign that read "FIND ME, BILL!" from the Doctor. Rushing to find him, Bill was too late to warn him of a Weeping Angel behind him.

As more and more Angels began appearing, Bill volunteered to try and vent the Angels into space before she reunited with the Doctor, having been sent back in time and arranged for his return. When it was found that the Weeping Angels were using the Heavenly Hosts as breeding stock, the Doctor evacuated the Jeden, leaving it to be consumed by a red giant star before taking everyone back to Earth. (COMIC: A Confusion of Angels [+]Loading...["A Confusion of Angels (comic story)"])

At Gosligi's Branch, the Doctor and Bill encountered a Dalek harvest ship abducting the local children. Using his childish mindset and some creative rewiring, the Doctor disabled the ship, gifting it to the locals. (COMIC: Harvest of the Daleks [+]Loading...["Harvest of the Daleks (comic story)"]) Eventually, Bill discovered a guide on how to be a companion in the TARDIS. Written by Clara Oswald, the guide detailed many of the Doctor's adventures and former travelling partners, with Clara hiding it in the one place she knew a companion would find it. Bill left her own message in the text. (PROSE: The Companion's Companion [+]Loading...["The Companion's Companion (novel)"])

After Bill got into an argument with the Doctor about the fate of the Ninth Roman Legion, they, along with a reluctant Nardole, travelled to 2nd century Scotland. Bill once again got separated from the Doctor when she was chased by Kar and then encountered a Roman. She witnessed the Roman get eaten by a mysterious creature and got rescued by the remaining Romans, who survived the creature's attack by running away. After being knocked unconscious for two days by the creature's slime, Bill awoke and worked with the Romans to find the Doctor. Upon being attacked by the creature again, Bill and the Romans escaped and encountered the Doctor and Nardole with the Picts. Bill and the Doctor helped the two sides work together and then worked to send the creature back through the portal where it came from. When the Doctor attempted to stay behind and guard the gate, Bill knocked him to the ground to stop him and reminded him of his duties to guard the vault on Earth. When they returned to the TARDIS, Bill and Nardole discovered that the Doctor had let Missy out of the vault for "maintenance". Despite his two companions not trusting her, the Doctor maintained the belief that Missy could change. (TV: The Eaters of Light [+]Loading...["The Eaters of Light (TV story)"])

Bill and Nardole, watched over by the Doctor, became Missy's companions on a test trip to determine whether she could reform from her evil ways. While surveying the colony ship they were on, Bill was mockingly called the "exposition" by Missy. Bill was mortally wounded by a paranoid technician who was the only one left of his crew, due to her being human and supposedly a target for an unknown threat. Unable to save her, the Doctor allowed her to be taken by medical figures who had come from the lower levels of the ship as he understood were capable of healing her. He left a message in her subconscious for the moment she awoke: "wait for me". (TV: World Enough and Time [+]Loading...["World Enough and Time (TV story)"])

Cyber-conversion[[edit] | [edit source]]

Bill realises she's a Cyberman. (TV: The Doctor Falls [+]Loading...["The Doctor Falls (TV story)"])

After several months for her, she awoke with a cybernetic heart in a hospital. Due to the spaceship's proximity to a black hole (causing time dilation within it), Bill was forced to wait a total of ten years for the Twelfth Doctor and in the meantime made friends with a man named Razor. Razor allowed her to watch the Doctor and the others upstairs, though time passed extremely slowly; by the time the Doctor raised an eyebrow, a week passed for Bill. Razor also took her outside the hospital once, explaining how everyone had to be converted to survive given the time differential with the upper levels. Bill, wanting to be with the Doctor, began to repeatedly ask him to take her to the lifts. Eventually, Razor apparently caved in and seemingly took her to the lifts. However, he had actually taken her to the Conversion Theatre, telling her that it was for her own good. She was then forcibly converted into the first Cyberman. Sometime later, the Doctor, Nardole, and Missy arrived. In the theatre, the Doctor found her, and asked her if she knew where Bill was, and told him that she was Bill, telling him, "I waited for you," as Missy, and Razor, (really the Master) took their places at her sides. (TV: World Enough and Time [+]Loading...["World Enough and Time (TV story)"])

Bill managed to reject the Cyber programming enough to help save the Doctor from another Cyberman, destroying it, and carry him to safety after the ship Nardole piloted crashed on Floor 0507, a solar farm. While staying there, she still believed she was herself, unable to understand why the villagers were scared of her. When Alit gave her a mirror, Bill realised she was in Cyber-form, causing her distress. An injured Doctor arrived and explained to her what a Cyberman was and how she was converted, speculating her mind now acted as a perception filter so she would still believe she was human. Bill, upon seeing her shadow, which confirmed she was a Cyberman, grew angry at the Doctor for not saving her, accidentally blasting a hole in the barn that further startled the villagers as they prepared for war. The Master soon arrived, informing the pair that his future self had found something of interest, momentarily teasing Bill about how he hated the ten years he had to spend with her on Floor 1056. Bill pretended that his cruelty did not upset her but was crying beneath her mask, something which surprised the Doctor.

While following the Master, Bill asked why the Cybermen were planning to invade Floor 0507, the Doctor replying that it was due to their desire to take the children. Bill questioned why the children specifically, though the Doctor withheld his reply, causing the Master to finish for him: "There is less to throw away". As the Doctor stumbled against a nearby tree, Bill began to lose hope, believing the scenario they found themselves in was inescapable- the Doctor even admitting he didn't know how he would get Bill back to normal. However, he briefly brightened Bill up by saying there was hope because she was still able to produce tears.

They arrived in the middle of a forest to find Missy using her sonic umbrella on a camouflaged lift. She briefly empathised with Bill's condition before calling the lift. Understanding a Cyberman would be in it, Bill ordered the others aside to combat the threat directly, the three Time Lords preparing their respective sonic devices behind her. An advanced model of Cyberman came from the lift, but the four managed to disable it after several seconds.

Bill later created a passageway for the children to escape in. When she went to inform Nardole of this, Hazran fired at her, believing her to be a Cyberman. This upset Bill and she went to talk to the Doctor, but before long the Cybermen arrived. The Doctor and Bill chose to remain and fight off the Cybermen despite Nardole's protests. He later bade farewell to Bill and the Doctor and was sent to defend the children.

Bill and Heather begin their travels. (TV: The Doctor Falls [+]Loading...["The Doctor Falls (TV story)"])

In the final battle, she was allowed to join the Doctor as he confronted the Cybermen. After the Doctor blew up Floor 0507, Bill was left alone on a battlefield. Heather appeared from a puddle and Bill found herself back in her body, and saw her Cyberman shell fall to the ground, dead. After taking the Doctor back to the TARDIS, Heather explained that she traced Bill through the tears she left; and also that Bill was now like her, a Sentient oil creature, but she could be made human again if she wanted. Once she had left her tears with the Doctor, Bill went to travel the universe with Heather. (TV: The Doctor Falls [+]Loading...["The Doctor Falls (TV story)"])

Later life[[edit] | [edit source]]

Bill and Heather travelled the universe together and visited all the places the Doctor never got around to showing Bill. Eventually, Bill decided she wanted to try being human again, if Heather was willing to live a human life on Earth with her. (PROSE: Twice Upon a Time [+]Loading...["Twice Upon a Time (novelisation)"]) Because of Heather's powers, Bill decided to take a break and return to St Luke's University, although Heather knew that they would get back together in four months, two weeks and three days.

During their break, Bill met another woman that she was attracted to. She was stuck in her flat due to COVID-19 and remained in contact with Nardole, who had a space-time telegraph on the colony ship, although he forbade her from sharing bad news. She kept thinking that she could hear the TARDIS materialise and hoped that she would recognise him in a new incarnation, telling Nardole that she would snog his face off if he were not a man. (WC: The Best of Days [+]Loading...["The Best of Days (webcast)"])

Bill and Heather purchased a home together, went clubbing, adopted cats and grew old together. Whilst dying of old age, she gave Heather permission to go back out into the universe and continue exploring. (PROSE: Twice Upon a Time [+]Loading...["Twice Upon a Time (novelisation)"])

Undated events[[edit] | [edit source]]

At some point, Bill had a date that was ruined by the Pope. (PROSE: Inflicting Christmas [+]Loading...["Inflicting Christmas (short story)"])

Legacy[[edit] | [edit source]]

Bill's memories were retained by the Testimony Foundation, which assumed her form as it interacted with the Doctor as well as his first incarnation and Archibald Hamish Lethbridge-Stewart. Though the Doctor, who believed Bill to have died in the Battle of Floor 0507, was sceptical as to the authenticity of Bill's image, she repeatedly insisted that she was truly Bill Potts. (TV: Twice Upon a Time [+]Loading...["Twice Upon a Time (TV story)"]) As he argued with the TARDIS about regenerating, the Doctor recalled Bill suggesting to the First Doctor that "some bloke" was the answer to the Doctor's question about what was keeping evil from winning in the universe and finally understood that it was himself that she was talking about and that she was right. (PROSE: Twice Upon a Time [+]Loading...["Twice Upon a Time (novelisation)"])

Bill's cyber-conversion was referenced by the Thirteenth Doctor, telling her new companions Graham O'Brien, Yasmin Khan and Ryan Sinclair not to follow her to confront Ashad as she refused to "lose anyone else" to the same fate. (TV: The Haunting of Villa Diodati [+]Loading...["The Haunting of Villa Diodati (TV story)"]) A short time later, Bill was one of many individuals she recalled to break free from the the Matrix on Gallifrey. (TV: The Timeless Children [+]Loading...["The Timeless Children (TV story)"])

The Toymaker would display a puppet show towards the Fourteenth Doctor and Donna Noble about the companions he had after Donna's departure, and retold Bill's fate of being killed by the Cybermen, though the Doctor remarked that her consciousness was still alive. (TV: The Giggle [+]Loading...["The Giggle (TV story)"])

Personality[[edit] | [edit source]]

Bill was very smart and inquisitive. She asked questions that most people didn’t ask, and admitted that "Questions [were] kind of [her] thing", (TV: Twice Upon a Time [+]Loading...["Twice Upon a Time (TV story)"]) and came to conclusions in a different way than other people normally did. She loved science fiction and was open to the idea that the concepts it proposed were real and affected the lives of those around her. When Heather introduced her to a strange puddle, she was open to the idea of alien lizard possession, no matter how preposterous the Twelfth Doctor found it. She was also easily able to figure out that the Doctor intended to wipe her memory when he tried to put his hands on her head, and even called out the Doctor for thinking she was stupid enough to fall for it. (TV: The Pilot [+]Loading...["The Pilot (TV story)"])

Bill's relationship with Moira tended to be similar to roommates rather than mother and daughter. Backing this up is that Bill tried to keep out of Moira's personal life by never remembering her partner's names; Bill hinted that she actually got along well with some of them. (TV: The Pilot [+]Loading...["The Pilot (TV story)"])

Bill was also rather bold. When Lord Sutcliffe demanded she submit to him because of her gender and race, Bill merely sneered at him. (TV: Thin Ice [+]Loading...["Thin Ice (TV story)"]) She further showed bravery; willingly entering the bathroom to face what was hiding in there and confronting the sentient oil, (TV: The Pilot [+]Loading...["The Pilot (TV story)"]) leading her group of flatmates when they were scared, (TV: Knock Knock [+]Loading...["Knock Knock (TV story)"]) speaking with Ice Queen Iraxxa of Mars even though she'd seen how dangerous Ice Warriors can be, (TV: Empress of Mars [+]Loading...["Empress of Mars (TV story)"]) and staying to combat the army of Early Cybermen as well as Legion Cybermen and Weapons-Grade Cybermen despite knowing full well she would die in the conflict. (TV: The Doctor Falls [+]Loading...["The Doctor Falls (TV story)"])

Bill also learned to understand the need to not dwell on matters that angered her as the Doctor taught her there simply wasn't time to waste on such matters. (TV: Thin Ice [+]Loading...["Thin Ice (TV story)"]) Her optimism kept her from breaking and preserved hope she'd meet her Doctor again. (TV: The Doctor Falls [+]Loading...["The Doctor Falls (TV story)"])

Bill was also more prone to profanity than many of the Doctor's other companions. She was implied to have sworn on multiple occasions, (TV: Thin Ice [+]Loading...["Thin Ice (TV story)"], The Lie of the Land [+]Loading...["The Lie of the Land (TV story)"]) and also once called the Twelfth Doctor a "bloody arse", much to the objection of his first incarnation who threatened to smack her bottom if she swore again. (TV: Twice Upon a Time [+]Loading...["Twice Upon a Time (TV story)"])

Bill was a lesbian. (TV: Knock Knock [+]Loading...["Knock Knock (TV story)"]) She had a crush on a girl who attended the Doctor's lectures, and developed an interest in another young woman, Heather. (TV: The Pilot [+]Loading...["The Pilot (TV story)"])

Despite having never met her mother, Bill invented an imaginary version of her which she spoke to for personal comfort. (TV: Oxygen [+]Loading...["Oxygen (TV story)"], The Lie of the Land [+]Loading...["The Lie of the Land (TV story)"]) According to Bill, this version always told her "with some people you can smell the wind in their clothes", a saying Bill made up based on what she thought her mother would say. (TV: The Pilot [+]Loading...["The Pilot (TV story)"])

Skills[[edit] | [edit source]]

Bill was extremely bright and quick-witted, able to perform well in the Doctor's university assessments with his tuition in the field of science, getting a First in every assignment, and impressed him enough beforehand that he saw potential in her. She was also able to deduce complex puzzles with only some prompting from the Doctor, notably that the puddle in the ground was not reflecting as a mirror and that the damaged cement was actually scorch marks of the ships, (TV: The Pilot [+]Loading...["The Pilot (TV story)"]) and that the lights, which she perceptively noticed, under the ice in the Thames were organic rather than artificial. (TV: Thin Ice [+]Loading...["Thin Ice (TV story)"]) Bill also deduced the TARDIS granted her the ability to speak different languages, (TV: The Eaters of Light [+]Loading...["The Eaters of Light (TV story)"]) and that the patients in the hospital were in severe pain despite "Razor" trying to convince her otherwise. (TV: World Enough and Time [+]Loading...["World Enough and Time (TV story)"])

She could even notice things the Doctor overlooked, such as the strangeness that a grown man would root through grass and trees for bugs, or that he wasn't old enough for the Doctor's theory to make sense.

She also possessed a strong will power. When the Monks took over Earth, Bill was able to maintain her memory of the Doctor and the world before their rule by using her imaginary image of her mother. (TV: The Lie of the Land [+]Loading...["The Lie of the Land (TV story)"]) When transformed into a Cyberman, she managed to retain her free will despite being fitted with an emotional inhibitor. (TV: World Enough and Time [+]Loading...["World Enough and Time (TV story)"]) The upgrade prolonged her lifespan (though it slowed her down to mere walking speed) and also gave her a cybernetic blaster on the handlebars on her headpiece. Using said blaster by channelling anger, she could blast a gaping hole in a barn and a concrete wall, incinerate another Mondasian Cyberman and could combine with the Master's modified laser screwdriver to disable a fully evolved Cyberman. The upgrade made her resistant to bullets, even when hit at close range. She also retained the ability to cry, a gift her romantically involved classmate Heather granted her to be able to find her. (TV: The Doctor Falls [+]Loading...["The Doctor Falls (TV story)"])

Appearance[[edit] | [edit source]]

Bill was a young black woman with an afro, worn in a variety of styles. (TV: The Pilot [+]Loading...["The Pilot (TV story)"], etc.) According to the Doctor's sonic sunglasses, Bill was female, was 26 years old by the time of the Monks' invasion, weighed 130.2 pounds, and measured 167.7 cm in height. (TV: The Pyramid at the End of the World [+]Loading...["The Pyramid at the End of the World (TV story)"])

She had problems with her face because it was "always doing expressions [when she was] trying to be enigmatic". (TV: The Pilot [+]Loading...["The Pilot (TV story)"])

Bill's appearance as a Cyberman. (TV: The Doctor Falls [+]Loading...["The Doctor Falls (TV story)"])

When mortally wounded by Jorj, she was partially cyber-converted, given a cybernetic chest-unit. While on the colony ship, she aged, her hair becoming generally messier and less profound. (TV: World Enough and Time [+]Loading...["World Enough and Time (TV story)"]) She was also eventually converted into a Mondasian Cyberman, subsequently looking like one, though she still inwardly perceived herself as looking human. (TV: The Doctor Falls [+]Loading...["The Doctor Falls (TV story)"])

Behind the scenes[[edit] | [edit source]]

File:Bill's Theme - DWFinaleCountdown - Doctor Who

Doctor Who The Official Annual 2018[[edit] | [edit source]]

According to the Doctor Who The Official Annual 2018, which is not accepted as a valid source for in-universe articles on this wiki, Bill started sneaking into the Doctor's lectures when she overheard the other students talking about how the Doctor "knew everything about everything" and wanted to know something herself.

Other matters[[edit] | [edit source]]

Bill Potts shares her name with First Doctor actor William Hartnell, who was often known as Bill or Billy, while Bill's first love interest shares her name with his wife Heather. She also shares the name with Billie Piper who played Rose Tyler, a companion to the Ninth and Tenth Doctors, as well as the Moment.

External links[[edit] | [edit source]]

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Companions of the Twelfth Doctor
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Narratively-ambiguous
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If a medium is not mentioned, then this incarnation did not have companions who were original to that medium; it does not mean that this Doctor failed to appear in that medium.
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