Wild Blue Yonder (TV story)

Wild Blue Yonder

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Wild Blue Yonder
Novelised as:	Wild Blue Yonder
Doctor:	Fourteenth Doctor
Companion(s):	Donna
Featuring:	Wilf
Main enemy:	Not-things
Main setting:	Spaceship, edge of the universe
Key crew
Writer:	Russell T Davies
Director:	Tom Kingsley
Release details
Story number:	302
Number of parts:	1
Premiere broadcast:	2 December 2023
Premiere networks:	BBC One, Disney+
Format:	1x54 minute episode
Unleashed:	Wild Blue Yonder
The Official Doctor Who Podcast:	Wild Blue Yonder
Official trailer
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Doctor Who television stories
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Next →	The Giggle
Production order
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Next →	Destination: Skaro

Wild Blue Yonder was the second of the three 2023 specials of Doctor Who, broadcast on 2 December 2023 as part of the 60th anniversary celebrations.

The story marked Donna Noble's first full adventure as a companion following the Doctor restoring her memories, with Wild Blue Yonder continuing immediately on from the end of The Star Beast. It is also the first televised story to explicitly show a male incarnation of the Doctor being attracted to another person of the same sex, with the Fourteenth Doctor shown agreeing with Donna that Isaac Newton was "hot"; this surprises the Doctor, showing he was still learning more about his new, yet familiar incarnation.

The story also allowed both David Tennant and Catherine Tate to play both the Doctor and Donna respectively but also the main antagonists of the story, the not-things, or "nobodies". This makes Tennant the seventh actor of the Doctor, following William Hartnell, Patrick Troughton, Tom Baker, Peter Davison, Colin Baker, and Matt Smith, to have played both the Doctor and one of the main antagonists in a story.

Notably, after being referenced in the previous story, Wild Blue Yonder saw the return of Bernard Cribbins as Wilfred Mott, marking Wilfred's first appearance in the series since The End of Time ^[+]Loading...["The End of Time (TV story)"] 13 years ago with the rest of the Noble family. However, this appearance from Cribbins would be posthumous, as the actor passed away in 2022 after filming his scenes and before being able to film other scenes featuring Wilfred that had been written prior to his death, making Wild Blue Yonder and the 2023 specials the final appearance of Wilfred and the final acting credit of Bernard Cribbins. Wild Blue Yonder was consequently dedicated to Cribbins' memory.

Wild Blue Yonder also explores the emotional impact of the Timeless Child revelation and the Flux on the Doctor. Particular, it shows that the events experienced by the Doctor's previous incarnation continue to weigh on the Fourteenth Doctor, with his current relationship to Gallifrey being "complicated".

Synopsis

The TARDIS, out of control, abandons the Doctor and Donna on a faraway, mysterious spaceship, with deadly secrets in every corner.

Plot

The Fourteenth Doctor and Donna crash the TARDIS in an apple tree in 1666 right as Isaac Newton was reaching his famous epiphany. They ask him what year it is, and from his answer figure out his identity. Donna is delighted in spite of the fact that that TARDIS is going haywire. She insists on making a joke about the gravity of the situation she and the Doctor find themselves in as they depart. Newton, still thinking about his epiphany, reflects on these last few words, trying to recall them. For his new discovery he has a name - "mavity".

The TARDIS then lands in an unknown spaceship, heavily damaged. The Doctor places his sonic screwdriver into the latch in order to prime the TARDIS to regenerate, to heal itself from the damage it's sustained. They take a look around the ship before hearing the TARDIS dematerializing as a result of the Hostile Action Displacement System. At first the two of them despair, but the Doctor explains to Donna that if they resolve whatever hostile action they've encountered there's a good chance the TARDIS will return to them. The two set off into the ship with renewed determination, marching down a long corridor. As they walk, the environment shifts around them and a loudspeaker blares "fenslaw". Neither of the two knows what this means - the TARDIS translates but has left, and the Doctor doesn't speak this language.

The two come across a small hovercraft and a slow moving robot, marching down the hallway. The pair find their way to a cockpit and try to decipher what they can from the ship's computer. There are no life signs on board, and the airlock had been opened once three years ago. The Doctor realises that the ship is one that had fallen through a wormhole and ended up on the edge of the universe, 100 trillion light years from everything else - not even starlight has yet propagated long enough to reach them.

The intercom blares "coliss" and the ship shifts again. The two wander into a room filled with drawers of baseplate repetition filaments. The Doctor asks Donna to move all the ones in a lower drawer to to a higher one - the ship is on idle and needs to be powered back up. The Doctor finds another room with a spindle and works on adjusting it. As Donna moves the plates it grows colder, which she murmurs about. The Doctor acknowledges the change in temperature to her. As the two talk the Doctor occasionally mumbles about his arms being too long.

The Doctor is still back in the room with the spindle and is still working on adjusting it as it grows cold and Donna enters. He's surprised at how fast Donna was. The two chat, and Donna mentions that her arms are too long. The Doctor turns to look at her and sees her arm to be stretched beyond all proportion, realizing that this isn't Donna.

Both the Doctor and Donna from the two rooms run back to each other, with their doppelgängers slowly following behind. They claim to have come from nothing, to be not-things. They chase the Doctor and Donna, who use the hovercraft to try and outpace them, but the not-things grow and twist in size, keeping pace, before eventually tangling together and blocking each other and the whole of the corridor, slowly beginning to untangle.

They climb upwards to a vent but as the intercom blares "brate" and the environment shifts they become separated. The two walk around separately, trying to find the other, and two pairs of Doctors and Donnas unite. The four try to convince their partners that they're real, through conversation or other means. But each of the not-things make mistakes as they're about to convince the others. The Doctor and Donna flee again, the intercom blaring "gilvane".

The four find themselves together in a room, and the Doctor and Donna figure out which of them is real by knowing enough about how the other acts. As the not-things begin to advance, the Doctor lays down a line of salt, insisting that they can't cross it without counting every grain. At first the two are dismissive, saying it's a superstition. But the Doctor insists, it's a superstition, and it's real, both at once. The Donna not-thing bends down and begins to count as they interrogate the Doctor not-thing, who they notice is slowly acclimatizing. The not-thing explains that they have heard the "noisy, boiling universe", and wish to venture there to play the games those in the universe do, that have given shape to the not-things. The Donna not-thing blows away the salt, and the duo advances as the intercom blares "stond".

The Doctor and Donna run back to the cockpit and lock themselves in, the not-things standing outside, slowly copying them more and more as the pair stresses and thinks. In order to combat this they try to think as little as possible, but find themselves unable to do so - the ship just has so many questions. They manage to find the captain of the ship circling the ship having killed themselves, and the not-things don't know why - they need to know why.

The intercom blares "ratico" as the Doctor explains that the captain killed themselves to stop the not-things from fully copying them, from knowing what she did to stop the duo from reaching the rest of the universe, slowly, so slowly that the duo could never know what it was. The ship is slowly reconfiguring into a bomb, the words being a countdown. "Vandeen." All four run after the robot, the trigger walking slowly towards the final button, the Doctor speeding up the countdown to prevent the not-things from stopping the self-destruct. "Blinss." The four scrap as they run towards the robot, the Donna not-thing trying to keep the pair away as the Doctor not-thing races towards the robot to stop it. "Sensill" As the Doctor not-thing gives up on trying to copy the Doctor and becomes quadrupedal in order to out speed the pair, the Doctor realizes that as the hostile action is resolved, the TARDIS should know, and the TARDIS begins to rematerialize. "One." He tries to determine which Donna is real, and pulls in the one that answers his questions to his satisfaction.

As he leaves, the other Donna cries, insisting that he got the wrong one, that she's real. "Tacsladia." The robot pushes the button and the explosion begins, rushing to meet her. On the TARDIS, the Doctor turns to face the Donna on board, having scanned her - her arms are ever so slightly too long. He ejects her and Donna rushes in, the pair hugging as the TARDIS dematerializes, flying away from the exploding ship. As they travel back to London, reflecting on their adventure, the Doctor ponders as to whether it was a good idea to use the salt, a superstition on the edge of the universe, where the walls are thin.

The Doctor and Donna land the TARDIS, back near the alley from which they took off in London — a day or two off, according to the Doctor. As they exit they find Wilfred Mott who is happy to see Donna until he notices and is shocked to see the Doctor with the same face he last saw him with 15 years ago, and becomes emotional and overjoyed to see him again, the Doctor in turn hugs him in delight, saying seeing Wilf again has made him feel so much better and now there's nothing wrong in the whole wide world. Wilf says that he's never lost faith, the Doctor would come back to save them. As they look around, small explosions and riots break out, and a plane crash lands not far away. Wilf is emphatic, the entire world is coming to an end and the Doctor needs to save them.

Cast

• The Doctor - David Tennant
• Donna Noble - Catherine Tate
• Wilfred Mott - Bernard Cribbins
• Isaac Newton - Nathaniel Curtis
• Mrs Merridew - Susan Twist
• The Doctor Acting Double - Daniel Tuite
• The Doctor Beast Double - Ophir Raray
• The Doctor Contortionist Double - Tommaso Di Vincenzo
• Donna Acting Double - Helen Cripps

Uncredited cast

to be added

Crew

Executive Producers   Russell T Davies, Julie Gardner and Jane Tranter with Joel Collins and Phil Collinson

Written by Russell T Davies	Produced by Vicki Delow	Directed by Tom Kingsley	Director of Photography [[DOP::Nick Dance BSC|Nick Dance BSC]]	Production Designer Phil Sims	Visual Effects Realtime Visualisation
Make-up Designer Claire Williams	Casting Director Andy Pryor CDG	Music Murray Gold	Costume Designer Pam Downe	Edited by Tim Hodges BFE	Special Effects Real SFX
Original theme music by Ron Grainer  •  Title sequence by Painting Practice & Realtime Visualisation  Music orchestrated & conducted by Alastair King  •  Music mixed by Jake Jackson  •  Music performed by BBC National Orchestra of Wales   •  In memory of Bernard Cribbins

General production staff Head of Production - Alex Protherough Executive Producer for the BBC - Rebecca Ferguson Production Executive - Steffan Morris Co-producer - Ellen Marsh Line Producer - Mark Devlin Production Manager - Delmi Thomas Supervising Location Manager - Iwan Roberts Location Manager - Daniel Wellstead Assistant Location Manager - Alex Moore Location Assistant - Shuaib Said Unit Manager - Kyle Yates Assistant Unit Manager - Tom Chalkley Production Co-ordinator - Sandra Cosfeld Assistant Production Co-ordinator - Liam Hobbs Production Assistant - David Slocombe Production Secretaries - Florence Trott, Chris Harkus Production Office Runners - Danilo Van-Der Nguyen, Lisa Elena Williams Unit Drivers - Paul Watkins, Jolyon Davey, Steve Darwent, Richard Hunt 1st Assistant Accountant - Greg Robinson Covid Coordinator - Leah Corcoran Covid Assistant - Ilona Tigere Script department Script Editor - Scott Handcock Camera and lighting department 1st Assistant Director - Gareth Tandy 2nd Assistant Director - Lauren Pate 3rd Assistant Director - Jennifer Day Floor Runners - Jac Lewis, George Cheetham, Helen Langford Script Supervisor - Ruth Vickers Camera Trainees - Elesha Pederson, Kudzai Dzokamushure Focus Pullers - Martin Payne, Jonathan Vidgen Key Grip - Bobby Williams Grip - Ken Hodgson Clapper Loaders - Sophie Hardcastle, Sarah Macleod Lighting Gaffer - Paul Jarvis Rigging Gaffer - Pete Chester Best Boy - Chris Kiley Steadicam Operator - Martin Stephens Electricians - Scott Smallwood, Andrew Truckle, Andy Green, Sion Davies	Art department Supervising Art Director - Robyn Paiba Art Directors - Jon Horsham, Kartik Kundan Nagar Assistant Art Director - Hakan Yoruk Art Department Assistant - Sam Hanson Art Department Co-ordinator - Jason Davies-Redgrave Production Buyer - Helen O'Leary Assistant Buyer - Taymar Lee Petty Cash Buyer - Billie Blue Williams Set Decorator - Adrian Anscombe Action Props Buyer - Tara Lily Johnston Concept Artist - Nandor Moldovan Graphic Designer - Stephen Fielding Standby Props - Phill Bull, Jonathan Barclay Standby Carpenter - Will Pope Prop Hands - Declan Petryna, Atiff Tahir, Calvin Evans, Ingo Hans, John Thomas, Joseph Craig, Ieuan Parker Standby Art Director - Ifan Lewis Rigging - Shadow Scaffolding Standby Riggers - Alex Herbert, Michael Boulton Standby Painter - Jessie Thomas Storeman - Charlie Malik Prop Master - Nick Thomas Props Chargehand - Stuart Rankmore Construction Manager - Brian Jones Practical Electrician - Phillip Jones Graphics Assistant - Aled Llyr Griffiths Draughtsperson - Matt Sanders Costume department Costume Supervisor - Laura Baker Assistant Costume Designer - Ros Marshall Costume Trainee - Lizzie Doody	Make-up and prosthetics Movement Stunt Co-ordinator - Derek Lea Stunt Performers - Donna Williams, Kim McGarrity, Renato Gjini Casting Casting Associate - Ri McDaid-Wren Casting Assistant - Ray Böhm General post-production staff Post-production Producer - Ceres Doyle Post-production Supervisor - Liv Duffin On-line Editors - Christine Kelly, Geraint Pari Huws Special and visual effects VFX Producer - Will Cohen VFX Editor - Matt Nathan VFX Co-ordinators - Siân Reynish, Livvy Edwards VFX Assistant - Sarah-Hoor Aboubakar SFX Supervisor - Danny Hargreaves Colourist - Gareth Spensley Compositors - Dean Adjeikum, Will Heath, Nathan Stobbs, Illi Gardner, Aoife Greenham Sound Sound Recordist - Alex Thompson Dubbing Mixer - Paul McFadden Sound Designer - Rob Ireland Foley Editor - Helen Faulkner Foley Artist - Gareth Rhys Jones Audio Post-production - Bang Post Production

Not every person who worked on this adventure was credited. The absence of a credit for a position doesn't necessarily mean the job wasn't required. The information above is based solely on observations of the actual end credits of the episodes as broadcast, and does not relay information from IMDB or other sources.
Note: Standby art director Ifan Lewis was erroneously credited as "Ifan Lewis Lewis"

Worldbuilding

• The Doctor once spent three years in orbit because the HADS prevented him from landing anywhere.
• Isaac Newton misheard Donna make a joke about gravity, instead naming it "Mavity".
• According to a draft version of the script released by Russell T Davies, the Doctor and Donna have traveled past the Condensate Reefs and beyond the Realm of the Boltzmann Brains, beyond matter, light and life.
• Donna was born in Southampton.
• Being The DoctorDonna gave Donna concurrent access to the everything the Doctor knows; so she is aware of the adventures of the Eleventh, Twelfth, and Thirteenth Doctors. As Donna herself noted though, she cannot see these memories clearly and likened it to 'looking into a furnace'.
• The Cloister Bell can be heard tolling within the TARDIS.
• The universe has shrunk to 37.5% of its original size. Thanks to the Flux destroying half of the 75% that was left in 1981; the Master accidentally caused an Entropy wave by cutting off CVEs that vented it into E-Space.
• The universe is infinite but still has an edge. This is apparently possible because of Camboolian flat mathematics.

Cultural references

• After finding a vehicle, the Fourteenth Doctor mimics the Thunderbirds character Parker, saying "Your car, milady", with Donna responding "Thank you, Parker!" as Lady Penelope.
• When questioning how the not-things grew if they were to have a set amount of mass, Donna remembers how Shaun would complain about this issue in the Venom films.

Notes

• This episode was dedicated to the memory of Bernard Cribbins, who passed away over a year before transmission.
  • After the episode aired Russell T Davies revealed that there were more scenes written for Cribbins to be in, suggesting Wilfred was supposed to have had a bigger role following his appearance in Wild Blue Yonder in the third and final special The Giggle. However, the decision was made to reduce Wilfred's role after it became clear Cribbins' health would prevent him from being on-set for extended periods: Cribbins would ultimately die shortly after production wrapped on the specials in July 2022, making his appearance in Wild Blue Yonder his final performance in his career. Wilfred still appears in The Giggle by way of a stand-in and archival recording of his voice.
• Unlike the other two 2023 specials, The Star Beast ^[+]Loading...["The Star Beast (TV story)"] and The Giggle ^[+]Loading...["The Giggle (TV story)"], the marketing of Wild Blue Yonder was kept incredibly vague and revealed very little about the plot. The BBC wished to maintain the surprises of the story and Russell T Davies wanted one of the specials to be a complete mystery. According to director Tom Kingsley, the secrecy had naught to do with "any surprise returning actors or villains", but because "we thought you might find it fun to watch it without knowing what's going to happen next".
• This story's debut was mentioned alongside the other 2023 specials in the non-fiction feature Back in Business published in Doctor Who The Official Annual 2024 on 7 September 2023.
• The preview of this episode released in DWM 597 revealed a teaser of the plot and a snippet of dialogue between the Doctor and Donna.
  • It also revealed a cast list consisting of Tennant, Tate, and three other names that had all been replaced with a "[REDACTED]". These were later revealed to be Nathaniel Curtis, Susan Twist, and Bernard Cribbins.
• No cast details accompanied the programme listing in Radio Times, which had the synopsis "In the second of Doctor Who's 60th anniversary special episodes, the Tardis takes the Time Lord and Donna to the furthest edge of adventure. To escape, they must face the most desperate fight of their lives. Starring David Tennant, Catherine Tate and Susan Twist." (original published text)
• The title of the episode was named after the song "Wild Blue Yonder". The song in question is both referenced and played by the TARDIS in the special itself.
• David Tennant called this special "unlike any Doctor Who episode ever", referring to the specials as a whole as "Russell [T Davies] off the leash".
• This was the second story to stream exclusively on Disney+ outside of the United Kingdom.
• First given in an advertisement on the BBC, the robot featured in promotional materials was named "Jimbo". This name was later given in the story by Donna and the Doctor to the robot.
• In Doctor Who Magazine Issue 597, Davies teased five words that would play a part in the special: Southampton, vegetable, bean, starlight, and Flux. He also revealed that the history of both the Flux and the Timeless Child would be "dealt with very slightly in this episode."
• This is the first episode following showrunner Chris Chibnall's departure to reference the Flux and the fact that the Doctor wasn't born on Gallifrey
• This is the seventh story in which the actor playing the Doctor also plays the main antagonist, following TV: The Massacre, The Enemy of the World ^[+]Loading...["The Enemy of the World (TV story)"], Meglos ^[+]Loading...["Meglos (TV story)"], Arc of Infinity ^[+]Loading...["Arc of Infinity (TV story)"], The Eleventh Hour, and Nightmare in Silver ^[+]Loading...["Nightmare in Silver (TV story)"]

Myths

• The Doctor and Donna would land on a corrupted TARDIS and be menaced by evil versions of the Eleventh and Twelfth Doctors. (This was proven false)

Filming locations

to be added

Ratings

• 4.83 million (UK overnight).

• 7.14 million (UK final).

Production errors

If you'd like to talk about narrative problems with this story — like plot holes and things that seem to contradict other stories — please go to this episode's discontinuity discussion.

• When the TARDIS returns to the Doctor, the sonic screwdriver is visibly missing from the keyhole it was placed in but is present in the next shot when the Doctor retrieves it.

Continuity

This section needs a cleanup.

As per Forum:Non-valid Continuity sections, categories, and prefixes#Continuity sections, this section needs to be written from an out-of-universe perspective.

• The Doctor's TARDIS regenerates itself from severe damage as it did in The Eleventh Hour ^[+]Loading...["The Eleventh Hour (TV story)"], The Woman Who Fell to Earth ^[+]Loading...["The Woman Who Fell to Earth (TV story)"] and The Ghost Monument ^[+]Loading...["The Ghost Monument (TV story)"]. Unlike on previous occasions, the Doctor triggered it rather than it automatically happening and it did not result in the TARDIS' appearance changing.
• The Doctor finds himself enthusiastically agreeing that Isaac Newton was hot, causing Donna to comment his preferences were "never far from the surface". Indeed, the Doctor (while not explicitly admitting it) has demonstrated attraction to individuals of the same sex before, notably Jack Harkness in Boom Town ^[+]Loading...["Boom Town (TV story)"], the Saxon Master in Last of the Time Lords ^[+]Loading...["Last of the Time Lords (TV story)"] and Yasmin Khan in Eve of the Daleks ^[+]Loading...["Eve of the Daleks (TV story)"] and Legend of the Sea Devils ^[+]Loading...["Legend of the Sea Devils (TV story)"].
• The Doctor and Donna are stranded due to the HADS activating as it had done before in Cold War ^[+]Loading...["Cold War (TV story)"], The Magician's Apprentice ^[+]Loading...["The Magician's Apprentice (TV story)"] and The Witch's Familiar ^[+]Loading...["The Witch's Familiar (TV story)"]
• The Doctor recalls Donna spilling coffee on the TARDIS console in The Star Beast ^[+]Loading...["The Star Beast (TV story)"].
• Donna orders the Doctor summon his TARDIS back without the sonic screwdriver. While he does not do so in this episode, he has previously been able to call the TARDIS to his location in The Time of the Doctor ^[+]Loading...["The Time of the Doctor (TV story)"]. Donna also comments on how he could snap his fingers as a way to communicate with the TARDIS, something he has done numerous times, such as in Forest of the Dead ^[+]Loading...["Forest of the Dead (TV story)"] and Day of the Moon ^[+]Loading...["Day of the Moon (TV story)"].
• Donna jokingly says “Allonsy”, mocking how the Doctor used to constantly say it when traveling with her as in The Runaway Bride ^[+]Loading...["The Runaway Bride (TV story)"], Partners in Crime ^[+]Loading...["Partners in Crime (TV story)"], Silence in the Library ^[+]Loading...["Silence in the Library (TV story)"]. She also calls him an idiot, a remark she also used to occasionally call him as seen in The Sontaran Stratagem ^[+]Loading...["The Sontaran Stratagem (TV story)"]
• Donna notes how she was unable to eat the meal her mother prepared for her because of the Doctor and the Meep arriving at her house in The Star Beast ^[+]Loading...["The Star Beast (TV story)"].
• The Doctor licks a substance to determine its properties, a trait that was present in their tenth incarnation seen in The Christmas Invasion ^[+]Loading...["The Christmas Invasion (TV story)"], The Idiot's Lantern ^[+]Loading...["The Idiot's Lantern (TV story)"] and Planet of the Dead ^[+]Loading...["Planet of the Dead (TV story)"]. This carried onwards into their eleventh incarnation such as in The Eleventh Hour ^[+]Loading...["The Eleventh Hour (TV story)"] and Day of the Moon ^[+]Loading...["Day of the Moon (TV story)"] as well as their thirteenth incarnation, like in It Takes You Away ^[+]Loading...["It Takes You Away (TV story)"].
• On learning that he and Donna have arrived in 1666, the Doctor advices Isaac Newton to avoid London. This is due to the Great Fire of London which he inadvertently caused in The Visitation ^[+]Loading...["The Visitation (TV story)"]
• When posing as Donna, one of the not-things mentions that the Doctor was not born on Gallifrey which they learned in The Timeless Children ^[+]Loading...["The Timeless Children (TV story)"]. In the same conversation, the Doctor states that the Flux "destroyed half of the universe because of me", referring to the events of The Vanquishers ^[+]Loading...["The Vanquishers (TV story)"].
  • The Master previously accidentally destroyed 25% of the universe (which included the Traken Union) with Entropy by closing off the Charged Vacuum Emboitements to E-Space in Logopolis ^[+]Loading...["Logopolis (TV story)"].
• Donna quips that the Doctor knows 27 million languages, which the Doctor corrects as over 57 billion; the Ninth Doctor previously remarked he knew 5 billion languages without the need for the TARDIS’ translation circuits in The Parting of the Ways ^[+]Loading...["The Parting of the Ways (TV story)"]. Furthermore, the Doctor remarks he doesn’t know the language used at the edge of the universe, recalling how his tenth incarnation did not know the language depicted by the Beast in The Impossible Planet ^[+]Loading...["The Impossible Planet (TV story)"]. The need for the TARDIS to help translate alien languages has been established several times, notably in The End of the World ^[+]Loading...["The End of the World (TV story)"], The Christmas Invasion ^[+]Loading...["The Christmas Invasion (TV story)"] and The Fires of Pompeii ^[+]Loading...["The Fires of Pompeii (TV story)"].
• Upon seeing one another, Donna and her not-thing counterpart remark that they like the other’s appearance. Amy Pond had a similar interaction when meeting her future self in Time ^[+]Loading...["Time (TV story)"].
• The Doctor once more loses his sonic screwdriver and TARDIS, forcing him to rely entirely on his intellect, as the Ninth Doctor and Twelfth Doctor experienced in Father's Day ^[+]Loading...["Father's Day (TV story)"] and Oxygen ^[+]Loading...["Oxygen (TV story)"] respectively.
• Upon the Doctor realising which is the real one, he calls her "earth girl", a nickname he called her sometimes, as seen in The Fires of Pompeii ^[+]Loading...["The Fires of Pompeii (TV story)"] and Journey's End ^[+]Loading...["Journey's End (TV story)"]
• The Doctor names a robot "Jimbo". The Ninth Doctor previously gave the name to a metal spider in The End of the World ^[+]Loading...["The End of the World (TV story)"].
• The Doctor is able to calculate how far away he and Donna are from Earth based by simply looking out to space. He previously did this when with Rose Tyler in The Impossible Planet ^[+]Loading...["The Impossible Planet (TV story)"].
• This episode features the Doctor travelling to the edge of the universe and unintentionaly freeing an enemy who will go on to oppress humanity, and who the Doctor must face in the next episode. The Tenth Doctor previously travelled to the end of time and unintentionally freed The Master in Utopia ^[+]Loading...["Utopia (TV story)"], who went on to oppress humanity and face the Doctor in the following story, The Sound of Drums ^[+]Loading...["The Sound of Drums (TV story)"]/Last of the Time Lords ^[+]Loading...["Last of the Time Lords (TV story)"].

Home media releases

DVD and Blu-ray releases

This episode, along with The Star Beast ^[+]Loading...["The Star Beast (TV story)"] and The Giggle ^[+]Loading...["The Giggle (TV story)"], was released on Region 2 DVD, and Region B Blu-ray and steelbook on 18 December 2023.

• 

  UK 2 DVD cover

• 

  UK Blu-ray cover

• 

  UK steelbook cover

Gallery

Main article: /Gallery