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{{mosnav|K9|Naming conventions}}
{{Infobox Individual
There is little doubt that [[Bob Baker]] and [[Dave Martin]] intended for their creation to be known as [[K9]]. This is readily apparent from PDFs of contemporary [[1970s]] documents available on the "classic" section of the official ''[[Doctor Who]]'' website. It is also evident in the fact that he is consistently styled "K9" in [[Target Books]] novelisations, such as, to pick a random example, ''[[Doctor Who and the Stones of Blood (novelisation)|Doctor Who and the Stones of Blood]]''. Stories in the [[K-9 Annual 1983|1983 K9 Annual]] also avoided hyphens, as did contemporary children's fiction like ''[[K9 and the Beasts of Vega]]''. The hyphen was also absent from ''some'' later, original novels — like ''[[The Well-Mannered War]]''. The style "K-9" was ''never'' used in any credit sequence of the 1970s or 1980s, and has generally (but not entirely) been avoided in [[BBC Wales]] productions. During the [[1963]] version of the show, K9 was only credited once in any way other than "K9", and that was in ''[[Full Circle]]'', where [[John Leeson]] was credited as the "Voice of K.9".  
|name= K9
|alias=
|image=K9.jpg 
|species= Robot
|origin= Various
|first= The Invisible Enemy (TV story)
|appearances= [[K9 - List of Appearances|List of Appearances]]
|actor= John Leeson
|other actor=[[David Brierley]]
}}
{{K9s}}
{{You may|K9 (TV series)|n1=the TV series}}
'''K9''' — occasionally styled '''K<!-- inserting comment to preserve this one instance of the alternate spelling in future bot maintenance -->-9 or K•9''' — was the designation given to a series of intelligent, [[dog]]-like [[robot]]s who served as companions of [[Marius|Professor Marius]], the [[Fourth Doctor]], [[Leela]], [[Romana]], [[Sarah Jane Smith]], [[Luke Smith]], and [[Starkey]].


This authorial intent has been carried through to the present day, where [[K9 (TV series)|the ''K9'' TV series]], of which Baker is the co-creator and associate producer, also uses exclusively a hyphen-less approach to the name. Neither the show's official website, nor is [[Network Ten]] advertisements, use anything ''other'' than ''K9'' as a way to style the name.
K9 Mark I, II, III, and IV addressed whomever is directing them as "Master" or "Mistress" depending upon gender, and used the formal "affirmative" and "negative" rather than "yes" and "no". They were programmed to be both loyal and logical, with a penchant for taking orders literally, almost to a fault. Their striped collars mirrored [[The Doctor's scarf|the Fourth Doctor's trademark scarf]].


So, if all that's true, where, then, do we get the seemingly popular "K-9"? ''[[Doctor Who Weekly]]''. The original editor, [[Dez Skinn]] — perhaps mistaking for a hyphen the little "dot" between the "K" and the "9" on the dog's bodywork — allowed the use of the hyphen in some of the very earliest [[Fourth Doctor comic stories]] in that magazine, and the hyphen stuck, as far as ''[[Doctor Who Magazine]]'' was concerned. It became a part of the "house style" of that magazine to write the name, "K-9". Fandom followed suit. As fans grew up and became part of the professional "industry" of ''Doctor Who'', "K-9" gained some, but not universal, traction.
== Biography ==
=== [[K9 Mark I]] ===
Professor [[Marius]], who invented [[K9 Mark I|the first K9]] in the year [[5000]] while working on the asteroid K4067, described him as "my best friend and constant companion." Marius had a dog on [[Earth]], but weight requirements did not allow him to bring his real [[dog]] into [[space]]; he built K9. ([[TV]]: ''[[The Invisible Enemy]]'') However, K9 might owe his existence to a [[temporal paradox]]. According to one account, the Professor copied the remnants of one of the versions of K9 created by [[the Doctor]] and given to [[Sarah Jane Smith|Sarah&nbsp;Jane Smith]]. ([[PROSE]]: ''[[Tautology]]'')


Thus you will find some [[1980s]] and [[1990s]] fiction (like, for instance, the short story "[[Housewarming]]" and the novel ''[[Interference]]'') which use "K-9". You will also find "K-9" used in the synopses printed on the covers of DVD releases. The [[Region 2]] release of ''[[Full Circle]]'', for examples, uses "K-9" in this way. And it's likely that we will occasionally still see "K-9" in future fiction, depending upon the age of the author, the preferences of the publisher, and other somewhat arbitrary factors.
The Professor offered K9 to the [[Fourth Doctor]] as the same weight requirements made him unable to take Mark I back to Earth. ([[TV]]: ''[[The Invisible Enemy]]'') After adventures with [[Leela]] and the Doctor, Mark I decided to stay on [[Gallifrey]] with his "mistress". ([[TV]]: ''[[The Invasion of Time]]'').
[[File:K9 05.jpg|thumb|right|K9 playing [[chess]] against the [[Fourth Doctor]]. ([[TV]]: ''[[The Sun Makers]]'')]]


Still, conforming to the general [[T:NAMING]] rule that the '''more common''' names shall apply, the rule we've adopted here is that '''K9''' "wins". Though "K-9" may be more ''familiar'' to some fans, "K9" is entirely more common in terms of the number of uses in credits, number of uses in the body of fictional works, and in terms of the two occasions in which K9 has headlined his own shows.
The [[Fourth Doctor]] and [[K9 Mark II]] spent an indeterminate period of time together. However, the Doctor appeared to be activating [[K9 Mark II]], implying that no significant time had elapsed since leaving [[Gallifrey]]. ([[TV]]: ''[[The Ribos Operation]]'') It is possible that the Doctor spent some time at [[Nest Cottage]] before activating him. ([[AUDIO]]: ''[[The Stuff of Nightmares]]'')
There are accounts that this model of K9 went on missions on behalf of the [[Time Lord]]s and was given control of a space vessel called ''[[K-NEL]]''. ([[The Adventures of K9]]: ''[[K9 and the Time Trap]]'', et al)


By writing this policy, we're not failing to acknowledge the legitimacy of arguments which might be constructed to defend the "K-9" rendering. We're merely saying that for ''stylistic'' purposes, it's important to pick one spelling and stick to it.
K9 stayed with Leela on [[Gallifrey]] for many years. It was only after the disappearance of her Time Lord husband, [[Andred]], that Leela and her K9 met [[Romana II|Romana]] and'' her ''K9. The two K9s did not get on well and competed. ([[AUDIO]]: ''[[Weapon of Choice]]'') After Leela became Romana's bodyguard and after many important missions on her behalf, Leela's K9 was destroyed by an exploding bomb. Leela was heartbroken, but refused to have a duplicate unit built. ([[AUDIO]]: ''[[Imperiatrix (audio story)|Imperiatrix]]'')
 
However, K9 survived this and the [[Last Great Time War]]. He witnessed the murder of [[Zanthus Pia]] by [[Ahab]]. His [[Jixen]] henchmen fought him and were transported to [[2050]] [[Earth]]. K9 self-destructed to protect the humans nearby, then regenerated into a [[K9 Mark 2|more advanced model]]. ([[TV]]: ''[[Regeneration (TV story)|Regeneration]]'',''[[The Bounty Hunter]]'')
 
=== [[K9 Mark II]] ===
Before this, the Doctor obtained or constructed at least one backup model of K9. Immediately after leaving Mark I behind with Leela, he unpacked [[K9 Mark II]]. This version of K9 accompanied the Doctor and his new companion on their quest to locate the segments of the Key to Time, ([[TV]]: ''[[The Ribos Operation]]'') but the swampy terrain of Delta III made it impossible for him to join them on the planet. At the conclusion of the quest, the Shadow turned K9 to his evil will, giving K9 a a sinister personality. ([[TV]]: ''[[The Armageddon Factor]]'')
 
The [[Fourth Doctor]] found that K9 had contracted laryngitis and had lost his voice as a result of this. K9 was left in the [[TARDIS]] while the Doctor and [[Romana II]] battled the [[Dalek]]s and [[Davros]]. ([[TV]]: ''[[Destiny of the Daleks]]'') During a later adventure, he remained patiently in the [[TARDIS]], which would imply that his voice had not yet returned. ([[TV]]: ''[[City of Death]]'') After his voice returned, it sounded quite different and remained so for a while ([[TV]]: ''[[The Creature from the Pit]]'') before the familiar voice returned. ([[TV]]: ''[[The Leisure Hive]]'')
 
This K9 exhibited the ability to sense and warn others of danger. He was also more mobile than his predecessor, despite his problems with the swamps of Delta III. ([[TV]]: ''[[The Armageddon Factor]]'') According to the [[Eleventh Doctor]], Mark II could hover. ([[TV]]: ''[[The Power of Three]]'')  The Doctor often used  a glib remark to disarm those who were surprised by K9's appearance, such as "They're all the rage in [[Trenton]], [[New Jersey]]." ([[TV]]: ''[[The Stones of Blood (TV story)|The Stones of Blood]]'')
 
K9 travelled to [[E-Space]] with the [[Fourth Doctor]] and [[Romana II]], where they met [[Adric]]. He had his head knocked off while trying to defend Romana, Adric, Varsh, Tylos and Keera. ([[TV]]: ''[[Full Circle]]'') [[File:K-9 About to have his Head Blew Off.jpg|thumb|K9's head about to be blown off]]
 
Damaged by the time winds, [[K9 Mark II]] could not cross back into N-Space with the Doctor. He decided to stay behind at the Gateway with [[Romana II]] to help her free the remaining Tharils from slavery. ([[TV]]: ''[[Warriors' Gate]]'') Eventually, Romana II and the presumably repaired K9 returned to their own universe and [[K9 Mark II]] came to live on [[Gallifrey]]. ([[PROSE]]: ''[[Lungbarrow]]'', [[WC]]: ''[[Shada (webcast)|Shada]]'', [[AUDIO]]: ''[[Zagreus (audio story)|Zagreus]]'')
 
During Romana's Presidency of Gallifrey, Leela became her bodyguard, and the two K9 units were forced to work together, not always amicably. After [[Matthias]] had replaced Romana as President, he nominated her to undertake a mission to find a cure for the [[Free Time]] virus, to be followed by exile. K9 opted to remain in the employ of Matthias, fighting the infection on Gallifrey. However, [[Braxiatel]] and K9 had planned another operation. Realising that the only cure to the virus was to end the regeneration capabilities of the Time Lords, Braxiatel used a [[Time Scoop]] to collect the Time Lord bio-data archive (along with K9). Romana was asked to decide whether to administer the cure or let Gallifrey die and rebuild it from scratch with the bio-data archive. Her decision is not known. ([[AUDIO]]: ''[[Gallifrey (audio series)|Gallifrey]]'')
 
The fates of K9 in light of the [[Last Great Time War]] remain unknown.
 
=== [[K9 Mark III]] ===
[[File:K-9 Mark III.jpg|thumb|right|K9 protecting [[the Doctor]] and the others. ([[TV]]: ''[[School Reunion]]'')]]
A third model, [[K9 Mark III]] (again either obtained or constructed by the Doctor) was shipped in [[1978]] to [[Sarah Jane Smith]] at the home she had shared with her [[Lavinia Smith|Aunt Lavinia]] in [[South Croydon]] during her companionship of the [[Third Doctor|Third]] and Fourth Doctors. ([[TV]]: ''[[A Girl's Best Friend]]'')  Since parting ways with the Doctor ([[TV]]: ''[[The Hand of Fear (TV story)|The Hand of Fear]]'') however, Sarah Jane had already away and was travelling extensively. [[1979|The following year]], Lavina purchased a manor house and market garden in [[Moreton Harwood]], Gloucester, and took the still crated K9 with her. On [[18 December]] [[1981]], Sarah Jane and her foster brother [[Brendan Richards]] arrived at Lavinia's home for Christmas, but Lavina had left early for her lecture series in the United States. Sarah Jane opened the crate and received her new companion. ([[TV]]: ''[[A Girl's Best Friend]]'')
 
K9 helped Sarah Jane to defeat Moreton Harwood's murderous [[Hecate Cult]]. ([[TV]]: ''[[A Girl's Best Friend]]'') ''Circa'' 1983, [[K9 Mark III]] and Sarah Jane lived in [[Uxbridge]] where their gate bore a "beware of dog" sign and Sarah Jane permitted him outside unconcealed. Sensing danger, he advised Sarah Jane to either not go out, or to take him with her. She declined, and K9 thus did not accompany her to Gallifrey. ([[TV]]: ''[[The Five Doctors (TV story)|The Five Doctors]]'') K9 accompanied Sarah to an archaeological dig in Egypt. ([[COMIC]]: ''[[City of Devils (comic story)|City of Devils]]'') In the early 1990s, K9 assisted Sarah in investigating a supposedly haunted house. ([[PROSE]]: ''[[Housewarming]]'')
 
In [[1996]], Sarah used K9 to hack into records and find [[Sam Jones]]' home address and later to translate Lost Boy's speech. ([[PROSE]]: ''[[Interference - Book One]]'') K9 was briefly possessed by a malevolent entity, but was freed when Sarah accidentally electrocuted him. ([[PROSE]]: ''[[The Sow in Rut]]'') K9 began slowly breaking down and eventually ended up deactivated in a cardboard box in Sarah's attic. ([[PROSE]]: ''[[Moving On]]'') [[Hilda Winters]] had K9 dismantled and analysed. ([[AUDIO]]: ''[[Mirror, Signal, Manoeuvre]]'')
 
In early [[2007]], while investigating the mysterious jump in student performance at [[Deffry Vale High School]], Sarah Jane encountered a science teacher, John Smith, whose peculiarly happy reaction to meeting her led her to suspect that he was her old friend, [[the Doctor]], ([[TV]]: ''[[School Reunion (TV story)|School Reunion]]'') who used the same alias when they first met decades earlier. ([[TV]]: ''[[The Time Warrior (TV story)|The Time Warrior]]'') When she returned to break into the school that night, she brought K9 in the boot of her car. John Smith confirmed that he was the [[Tenth Doctor]] and was gleeful to be reunited with not only Sarah Jane, but K9 as well. He was able to repair K9 sufficiently to restore function. When [[Rose Tyler]] described K9's design as "... so disco!" the Doctor replied that it was cutting edge in the year 5000.  K9's repairs were short lived. In battling [[Lucas Finch]] and his [[Krillitane]] invasion at the school the next day, Mark III self-destructed to save the Doctor, his companions, and the pupils. Before doing so, Mark III caused [[Mickey Smith]] to recognise his relative position vis-a-vis the Doctor and Rose ("I'm a tin dog."), leading to his invitation to travel as a companion. ([[TV]]: ''[[School Reunion (TV story)|School Reunion]]'')
 
=== [[K9 Mark IV]] ===
[[File:Small k9.png|thumb|left|K9 communicating with [[Sarah Jane Smith]] via a subspace portal linked to [[13 Bannerman Road]]. ([[TV]]: ''[[Invasion of the Bane]]'')]]
 
As a heartbroken Sarah Jane watched, the TARDIS dematerialised to reveal [[K9 Mark IV|Mark IV]]  It is not known whether the Doctor quickly built Mark IV from scratch or had it in storage. K9 referred to himself as being rebuilt and improved, suggesting Mark IV possessed the same memories as Mark III, essentially analogous to a [[Time Lord]] [[regeneration]]. ([[TV]]: ''[[School Reunion]]'') Though Sarah Jane didn't find this out right away, the Doctor had also placed some gifts in a panel in K9's side: two [[sonic lipstick]]s and a [[scanner watch]] that could detect [[alien]] life. ([[TV]]: ''[[Invasion of the Bane (TV story)|Invasion of the Bane]]'', ''[[Enemy of the Bane (TV story)|Enemy of the Bane]]'')
 
Almost as soon as he arrived, [[K9 Mark IV]] left Sarah Jane to stabilise a dangerous [[black hole]] in space which had been created in [[Switzerland]]. He could only speak with Sarah Jane occasionally via a cabinet with a space-time link when the orbit of the black hole intersected with [[Earth]]'s and did not know when he would complete the job. ([[TV]]: ''[[Invasion of the Bane]]'') However, he returned to Earth very briefly during emergencies. He did so on two later occasions in order to render vital assistance. The first time, he fought [[Mr Smith]] in pitched battle to give Sarah Jane time to upload the Armageddon Virus. ([[TV]]: ''[[The Lost Boy (TV story)|The Lost Boy]]'') The second time, he quickly uploaded TARDIS base codes to [[Mr Smith]], assisting the [[Tenth Doctor]] in returning [[Earth]] to its correct location in space. ([[TV]]: ''[[Journey's End (TV story)|Journey's End]]'')
 
After these events, he returned to monitoring the black hole. He emerged to find a member of the [[Slitheen family]] attempting to steal him as part of a revenge plot against Sarah Jane, as she had foiled their plans in the past. K9 banished the Slitheen after reversing one of its attacks. ([[TV]]: ''[[From Raxacoricofallapatorius With Love]]'')
 
K9 returned when [[Ship]] used the black hole as fuel. Though Sarah Jane, [[Luke Smith|Luke]], [[Rani Chandra|Rani]] and [[Clyde Langer|Clyde]] were happy to have K9 back, [[Mr Smith]] was not. ([[TV]]: ''[[The Mad Woman in the Attic]]'') K9 spent a lot of his time in Sarah Jane's attic at [[13 Bannerman Road]], [[Ealing]], but left to defeat [[Travist Polong]]. He attended Sarah Jane's abortive wedding to [[Peter Dalton]], where he helped the [[Tenth Doctor]], Luke, Rani and Clyde defeat [[the Trickster]]. ([[TV]]: ''[[The Wedding of Sarah Jane Smith]]'') After helping defeat the [[Slitheen family]], Clyde brought K9 to [[Park Vale Comprehensive School]] to help him with his test. He helped defeat the [[Rakweed]] before returning home. ([[TV]]: ''[[The Gift (TV story)|The Gift]]'') K9 went to the [[University of Oxford]] with Luke, but restored [[Mr White]]'s original programming through a [[mobile phone]].([[TV]]: ''[[Goodbye, Sarah Jane Smith]]'')
 
Unlike 25 years earlier in Uxbridge where she appeared unconcerned with K9 Mark III being seen, Sarah Jane restricted K9 Mark IV to her Ealing house except in emergencies or when she required his services, lest she have to explain him. Her son Luke covered by claiming K9 was a Japanese robot toy with pre-programmed phrases. ([[TV]]: ''[[The Wedding of Sarah Jane Smith]]'') Nevertheless, she sent K9 to serve Luke when he went away to the [[University of Oxford]]. ([[TV]]: ''[[The Nightmare Man (TV story)|The Nightmare Man]]'')
 
Whereas Sarah Jane lifted K9 Mark III into and out of her car, ([[TV]]: ''[[A Girl's Best Friend]]'') K9 Mark IV had a "hover mode" allowing him to negotiate the stairs of the Smiths' three-storey house and bi-level attic, and to enter and exit cars. ([[TV]]: ''[[The Wedding of Sarah Jane Smith]]'', ''[[The Gift (TV story)|The Gift]]'') The [[Eleventh Doctor]] implied that Mark IV was not the first to have the ability to hover. ([[TV]]: ''[[The Power of Three]]'')
 
In [[2056]], Sarah left K9 to a boy who would later help [[Drax]] search for the [[Sixth Doctor]], who was being held captive by [[Omega]]. ([[FYF]]: ''[[Search for the Doctor]]'')
 
==== Living art simulation ====
 
During an encounter with the sentient painting, the [[Mona Lisa]] at the [[International Gallery]], a simulation of K9 Mk IV was created when Mona Lisa was tricked into animating a drawing of K9 made by Clyde inside a cloud of mystic drawing-animation energy. He subsequently defeated [[The Abomination (Mona Lisa's Revenge)|''The Abomination'']], another evil painting-come-to-life, before disappearing as the Mona Lisa herself reverted to being an immobile painting. ([[TV]]: ''[[Mona Lisa's Revenge]]'')
 
=== [[K9 Mark 2]] ===
[[File:K-9 hovering.jpg|thumb|left|The future K9. ([[TV]]: ''[[Regeneration (TV story)|Regeneration]]'')]]
 
After Mark I sacrificed himself to destroy the Jixen warriors, [[Starkey]] retrieved his [[regeneration unit]]. K9 was rebuilt as a much more advanced model, but had no memories. He stayed at the house of [[Alistair Gryffen]], who ran tests on K9, but did not tell [[the Department]]. K9 tried to kill Starkey, as he was sprayed with Jixen genetic matter and so registered as a Jixen. Starkey convinced him that he was not an enemy and K9 gave him his dog whistle to summon him when needed. ([[TV]]: ''[[Regeneration (TV story)|Regeneration]]'') K9 and the team tracked down the surviving Jixen to [[Dauntless Prison]] and killed it. They also faced a [[Meron]] and freed the alien prisoners. ([[TV]]: ''[[Liberation]]'') K9 travelled with Starkey when he was on the run from the Department and rescued Gryffen (who was kidnapped by a [[Korven]]). Gryffen later welcomed him and Starkey into his home. ([[TV]]: ''[[The Korven]]'')
 
Later he defeated Ahab, who tried to convince him he had murdered Zanthus Pia. He became part of the K9 Unit, being made the responsibility of Gryffen and under the control of Department inspector [[June Turner]]. ([[TV]]: ''[[The Bounty Hunter]]'') He foiled Inspector [[Drake]]'s plan to control the population using [[Cerulium]] ([[TV]]: ''[[Sirens of Ceres]]'') and experienced fear. ([[TV]]: ''[[Fear Itself (TV story)|Fear Itself]]'') He aided in the defeat of echoes of Gryffen's family, ([[TV]]: ''[[The Fall of the House of Gryffen]]'') [[Orthrus]], a [[List of Doppelgängers|duplicate]] of him created by Drake to frame him ([[TV]]: ''[[Jaws of Orthrus]]'') and the [[Bodach]]. ([[TV]]: ''[[Dream-Eaters]]'') He met [[Nehetka]] and [[Geb]] of the [[Anubian]]s, a race his previous incarnation liberated. He was so obsessed with regaining his lost memories that he didn't notice Gryffen, Starkey and Jorjie's takeover by the Anubians. He soon found out when the Anubians attacked the Department. With Darius' help, he defeated them. ([[TV]]: ''[[Curse of Anubis]]'')
 
He helped Starkey fight the [[Oroborus]], ([[TV]]: ''[[Oroborus (TV story)|Oroborus]]'') free the [[Mede]]s ([[TV]]: ''[[Alien Avatar]]'') and help one of the last [[Aeolian]]s find her mate. ([[TV]]: ''[[Aeolian (TV story)|Aeolian]]'') He saved a [[Centuripede]] and her young from being killed by Drake ([[TV]]: ''[[The Last Oak Tree]]'') and absorbed [[the Hunger]] swarm which threatened to devour Earth. ([[TV]]: ''[[Black Hunger]]'') Starkey and he went through the STM to [[1963]], where they rescued Jorjie and saved Darius' great-grandfather [[William Pike]] from arrest and Darius from erasure from history. ([[TV]]: ''[[The Cambridge Spy]]'') He enlisted the help of the [[Ukkan]] librarian [[Yssaringintinka]] to rescue Starkey, trapped on the planet [[Urlic]]. ([[TV]]: ''[[Lost Library of Ukko]]'') He helped [[Birdie]], a [[CCPC]] whith implanted human DNA, escape from the Department. ([[TV]]: ''[[Mutant Copper]]'') He discovered the last of the [[Etydion]]s ([[TV]]: ''[[The Custodians]]'') and taught [[Taphony]] how to be a friend. ([[TV]]: ''[[Taphony and the Time Loop]]'')
 
Either Inspector [[Thorne]] or [[Lomax (K9)|Lomax]] found out about K9's regeneration unit and decided to acquire it. Thorne joined forces with [[Freddie Maxwell]], owner of [[Crashclub]] involving old robots being made to fight. K9 went undercover as a gladiator and made friends with the robot clowns [[Chuckles]] and [[Boris (Robot Gladiators)|Boris]]. He was called to fight the [[Pain-Maker]], who was laced with the explosive [[solarmite]]. When he was set to self-destruct, K9 detected this and fled the explosion. ([[TV]]: ''[[Robot Gladiators]]'') To regain his memory and find out his connection to the STM, K9's archive was scrambled. Directives from the STM almost caused him to self-destruct and lose all his memory. However, with Gryffen and Starkey's help he overrode the directives. ([[TV]]: ''[[Mind Snap]]'') He helped Gryffen find the STM's temporal stabiliser from the [[fallen angel]] crash site in [[Canada]], where it was revealed to be Korven technology. ([[TV]]: ''[[Angel of the North]]'') He stopped haywire CCPCs when [[The Last Precinct]]'s plan backfired. ([[TV]]: ''[[The Last Precinct (TV story)|The Last Precinct]]'')
 
After this he was tricked by Thorne to give him his regeneration unit for a lost memory chip/ This turned him into a bomb to make him self-destruct on encountering [[Jixey]]. Starkey helped him disarm himself. ([[TV]]: ''[[Hound of the Korven]]'') K9 Mark 2's brief life was almost cut tragically short when after the fall of the Korven invasion force, [[Thorne]] sent the [[Trojan]] to kill K9, who defeated it by burning out his power core and exhausting all his energy. As his regeneration unit was in the Trojan, K9 seemingly died at the mansion after his companions bade him farewell. However his regeneration unit homed in at the last minute and resurrected him, giving the frisky pup a new lease on life. The regeneration unit restored his old dog collar so he could celebrate the joyful occasion to the full as he flew off to more adventures, bristling with life. ([[TV]]: ''[[The Eclipse of the Korven]]'')
 
==== Future Models ====
According to [[Braxiatel]], [[Bernice Summerfield]] gave him a [[K9]] model at some point.  ([[AUDIO]]: ''[[Weapon of Choice (audio story)|Weapon of Choice]]'') However, Brax was an almost habitual liar, and no definitive account of this act of generosity was known to exist.
 
== Personality ==
K9 had a personality very consistent across the models with some contact with [[the Doctor]]. He was polite and formal, with pedantry bordering on condescension. Though he often displayed feelings such as sorrow ([[TV]]: ''[[The Invasion of Time]]'') and self-regard ([[TV]]: ''[[School Reunion]]''), he often stated that he had not been programmed to have emotions. ([[TV]]: ''[[Invasion of the Bane]]'')
 
He did not use contractions such as "you've" for "you have" and addressed others by titles such as "Master", "Mistress", "Doctor-Master" (to refer to the Doctor) or "Young Master" ([[Adric]], [[Starkey]] and in one instance, [[Clyde Langer|Clyde]]). Though he did not seem to resent his subordinate status, he sided with the Doctor's companions over the Doctor and showed a dark side, regarding other artificial intelligences with contempt. ([[TV]]: ''[[The Invasion of Time]]'', [[TV]]: ''[[The Wedding of Sarah Jane Smith]]'', [[TV]]: ''[[Robot Gladiators]]'') He relished a brief chance to act as a figure of power. ([[PROSE]]: ''[[The Well-Mannered War]]'')
[[File:K91.jpg|thumb|left|K9 at the beach. ([[TV]]: ''[[The Leisure Hive]]'')]]
He usually did not engage in [[computer]]-like literal thinking, though on one occasion he followed Romana's instructions to "forget it" to the letter and erased all knowledge of [[tennis]] from his memory banks. ([[TV]]: ''[[The Stones of Blood]]'')
 
With his great intelligence, he had a tendency to bore people with facts and did not stop immediately when asked, as he did to [[Leela]] on [[Pluto]]. When being told that he would have to stay behind in the [[The Doctor's TARDIS|TARDIS]], K9 often argued, giving the Doctor reasons why he should go such as "he would be a good [[dog]]." K9 always wanted to assist the Doctor. He had great intelligence and skill at [[chess]], claiming to be able to beat the Doctor in six moves (although this may only have been because he was programmed with all [[chess]] games since [[1886]]). ([[TV]]: ''[[The Sun Makers]]'', ''[[The Androids of Tara]]'') K9 had an aggression mode. ([[TV]]: ''[[State of Decay]]'')
 
[[K9 Mark 2]] had some obvious commonalities with the [[K9 Mark I|Mark I]] that had preceded him. However, as he had almost completely lost his ''personal'' memories, he was forced to reacquaint himself with the world around him. Toward this end, he downloaded thousands of [[human]] movies onto his memdrive, which peppered his speech with [[20th century|20th]] and [[21st century]] [[English]] colloquialisms that his "brothers" did not typically employ. ([[TV]]: ''[[Alien Avatar]]'') Despite his negative opinions of emotions, ([[TV]]: ''[[Mutant Copper]]'') he asked questions about some, such as fear ([[TV]]: ''[[Fear Itself (TV story)|Fear Itself]]'') and love ([[TV]]: ''[[Aeolian (TV story)|Aeolian]]''). He even showed some, laughing when he saved the day, feeling fear ([[TV]]: ''[[Fear Itself (TV story)|Fear Itself]]'') and being angry. ([[TV]]: ''[[Regeneration (TV story)|Regeneration]]'')
 
== Features ==
[[K9 Mark I]]'s mechanisms included rotating ear-probes, telescopic 'eye' probe, an extendable nose concealing a powerful laser weapon, flashing lights on the top and the 'eye' panel, waggling tail antennae, and ticker-tape tongue. His head could move up and down. His shell was painted in metallic gold/grey. There was a monitor screen on his left flank, though K9 rarely used this during his travels with the Doctor. Around K9's neck was a tartan collar, from which hung a silver disk. ([[TV]]: ''[[The Invisible Enemy]]'') He was later modified to fly through the [[vacuum]] of space. ([[TV]]: ''[[Curse of Anubis]]'')
 
After [[K9 Mark I]] was left behind with [[Leela]] on [[Gallifrey]], [[the Doctor]] built an improved [[K9 Mark II]]. In addition to minor cosmetic alterations on the previous model (including the new metallic charcoal paint-work), K9 Mark II also had a slightly different character from his predecessor. Gone was the product of Marius' version's 5000 AD technology. This new K9 was a product of the Doctor's own technology and values. The gun was now used for stunning, not killing and he responded to a [[dog]]-whistle. K9 also featured a vast memory-bank, seemingly a mixture of the [[K9 Mark I|Mark One]] model, the Doctor's own memory and knowledge and the [[TARDIS]]. ([[TV]]: ''[[The Invasion of Time]]'')
 
When the Doctor left [[Sarah Jane Smith]] on [[Earth]], he created [[K9 Mark III]] as Sarah's [[companion]]. The new mechanics of [[K9 Mark III]] included larger wheels and a front and back-wheel drive. K9 was also given a brand new coat of paint (this time a metallic blue) and a handle on top of his shell to make carrying him easier. ([[TV]]: ''[[A Girl's Best Friend]]'')
 
When the [[Tenth Doctor]] created [[K9 Mark IV]] to replace [[K9 Mark III]], he added a shiny metallic blue paint job and other improvements, including an omniflexible hyperlink facility. ([[TV]]: ''[[School Reunion]]'') Later, though, K9 reverted to his old dark green colour. ([[TV]]: ''[[Invasion of the Bane]]'') In battling [[Mr Smith]] (and following the battle) K9 displayed a teleport facility and a laser weapon similar to the previous K9s'. ([[TV]]: ''[[The Lost Boy]]'')
 
After [[K9 Mark I]] regenerated into [[K9 Mark 2]], his design was radically altered. His ear probes were replaced with larger silver aerials. A set of blue lights on his head flashed when he spoke. Most of his body was dark silver and a silver dog bone was located under his neck. He seemed to have the same capabilities as Mark I but was presumably more advanced. ([[TV]]: ''[[Regeneration (TV story)|Regeneration]]'')
 
After K9 Mark 2's apparent rejuvenation, he looked similar to his predecessor, but with a bright blue coat of paint and K9 Mark I's old collar. ([[TV]]: ''[[The Eclipse of the Korven]]'')
 
== Marks ==
[[File:School Reunion.jpg|thumb|right|The deactivated K9 with [[the Doctor]], [[Sarah Jane Smith]], [[Mickey Smith]], and [[Rose Tyler]]. ([[TV]]: ''[[School Reunion]]'')]]
* '''[[K9 Mark I]]''' was created about the year [[5000]] by Professor [[Marius]], who gifted the dog to the [[Fourth Doctor]] and [[Leela]]. He was left behind with [[Leela]] on [[Gallifrey]]. ([[TV]]: ''[[The Invasion of Time]]'') Some time later, he was blown up by a bomb on Gallifrey, ([[AUDIO]]: ''[[Imperiatrix (audio story)|Imperiatrix]]'') but survived. This model came to an end when [[Alistair Gryffen]]'s [[Space-Time Manipulator]] randomly pulled him to [[London]] in the year [[2050]]. There, he almost immediately self-destructed to protect Gryffen and a group of teenagers from [[Jixen]] warriors. ([[TV]]: ''[[Regeneration (TV story)|Regeneration]]'')
* '''[[K9 Mark II]]''' was created by the [[Fourth Doctor]] as a "backup" when it became obvious that the Mark I was becoming erratic. ([[AUDIO]]: ''[[The Time Vampire]]'') He was left behind with [[Romana II]] in [[E-space]], ([[TV]]: ''[[Warriors' Gate]]''; [[AUDIO]]: ''[[The Choice (audio story)|The Choice]]'', ''[[The Search]]'') and apparently made it back to [[Gallifrey]] when she became [[Lord President|Lady President]] of the [[High Council]]. ([[WC]]: ''[[Shada (webcast)|Shada]]'', [[AUDIO]]: most titles)
* '''[[K9 Mark III]]''' was a gift from [[the Doctor]] to [[Sarah Jane Smith]] ([[TV]]: ''[[A Girl's Best Friend]]''). He sacrificed himself to save [[Deffry Vale High School]] from [[Krillitane]]s. ([[TV]]: ''[[School Reunion]]'')
* '''[[K9 Mark IV]]''' was a recreation and enhancement of the Mark III created by the [[Tenth Doctor]] as a second present for Sarah Jane. ([[TV]]: ''[[School Reunion]]'') This model continued in service to his mistress, [[Luke Smith]], [[Clyde Langer]], and [[Rani Chandra]] and was known by [[Maria Jackson]] and [[Kelsey Hooper]].
* '''[[K9 Mark 2]]''' was the result of the activation of the Mark I's on-board [[regeneration unit]]. He had only very limited memories of his past as the Mark I. He had many adventures with Alistair Gryffen, [[Jorjie Turner]], [[Darius Pike]] and his new master [[Starkey]]. ([[TV]]: ''[[Regeneration (TV story)|Regeneration]]'', ''[[The Bounty Hunter]]'')
** '''[[Orthrus]]''' was an attempt by [[Drake]] and [[the Department]] to replicate K9, but it was of vastly inferior design. ([[TV]]: ''[[Jaws of Orthrus]]'')
 
== Behind the scenes ==
* In an interview, the writers said they originally wanted to name K9 "Pluto", after the Disney character; however, Disney refused permission.
* Another name used in an early draft of ''The Invisible Enemy'' was FIDO, for "Phenomenal Indication Data Observation". ([[INFO]]: ''[[The Invisible Enemy (TV story)|The Invisible Enemy]]'')
* The original K9 model was designed by [[visual effects designer]] [[Tony Harding]]. One early concept was to have a small actor in a large Doberman-shaped costume; however, [[Graham Williams]] vetoed this, saying that the robot should not look like a person in a costume. The eventual design was closely based on Harding's third concept sketch. ([[DCOM]]: ''[[The Invisible Enemy (TV story)|The Invisible Enemy]]'')
* The voice of K9 was inspired by the film, ''[[wikipedia:Billion Dollar Brain|Billion Dollar Brain]]'', albeit at a much higher pitch.{{fact}}
* K9 was also a contestant on [[The Weakest Link: Doctor Who Special 2007|the ''Doctor Who'' special of ''The Weakest Link'']]. While the other contestants were ''Doctor Who'' actors appearing as themselves, K9 remained in-character and was the first contestant to be voted off.
* K9 was referenced on the American tv show ''Community'', as the character Abed describes himself as a dispassionate observer in the style of various other tv/movie characters.
* K9 also appears in the non-canonical 1990 special ''[[Search Out Space]]''. It is not known which model of K9 this is supposed to be.
 
== External links ==
* [http://nzdwfc.tetrap.com/archive/tsv41/affirmativemaster.html "Affirmative, Master: All You Ever Wanted to Know about K9" by Jon Preddle]
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[[Category:K9| *]]
[[Category:Sarah Jane Smith]]
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[[Category:Tenth Doctor companions]]

Revision as of 10:27, 5 January 2013

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K9 — occasionally styled K-9 or K•9 — was the designation given to a series of intelligent, dog-like robots who served as companions of Professor Marius, the Fourth Doctor, Leela, Romana, Sarah Jane Smith, Luke Smith, and Starkey.

K9 Mark I, II, III, and IV addressed whomever is directing them as "Master" or "Mistress" depending upon gender, and used the formal "affirmative" and "negative" rather than "yes" and "no". They were programmed to be both loyal and logical, with a penchant for taking orders literally, almost to a fault. Their striped collars mirrored the Fourth Doctor's trademark scarf.

Biography

K9 Mark I

Professor Marius, who invented the first K9 in the year 5000 while working on the asteroid K4067, described him as "my best friend and constant companion." Marius had a dog on Earth, but weight requirements did not allow him to bring his real dog into space; he built K9. (TV: The Invisible Enemy) However, K9 might owe his existence to a temporal paradox. According to one account, the Professor copied the remnants of one of the versions of K9 created by the Doctor and given to Sarah Jane Smith. (PROSE: Tautology)

The Professor offered K9 to the Fourth Doctor as the same weight requirements made him unable to take Mark I back to Earth. (TV: The Invisible Enemy) After adventures with Leela and the Doctor, Mark I decided to stay on Gallifrey with his "mistress". (TV: The Invasion of Time).

K9 playing chess against the Fourth Doctor. (TV: The Sun Makers)

The Fourth Doctor and K9 Mark II spent an indeterminate period of time together. However, the Doctor appeared to be activating K9 Mark II, implying that no significant time had elapsed since leaving Gallifrey. (TV: The Ribos Operation) It is possible that the Doctor spent some time at Nest Cottage before activating him. (AUDIO: The Stuff of Nightmares) There are accounts that this model of K9 went on missions on behalf of the Time Lords and was given control of a space vessel called K-NEL. (The Adventures of K9: K9 and the Time Trap, et al)

K9 stayed with Leela on Gallifrey for many years. It was only after the disappearance of her Time Lord husband, Andred, that Leela and her K9 met Romana and her K9. The two K9s did not get on well and competed. (AUDIO: Weapon of Choice) After Leela became Romana's bodyguard and after many important missions on her behalf, Leela's K9 was destroyed by an exploding bomb. Leela was heartbroken, but refused to have a duplicate unit built. (AUDIO: Imperiatrix)

However, K9 survived this and the Last Great Time War. He witnessed the murder of Zanthus Pia by Ahab. His Jixen henchmen fought him and were transported to 2050 Earth. K9 self-destructed to protect the humans nearby, then regenerated into a more advanced model. (TV: Regeneration,The Bounty Hunter)

K9 Mark II

Before this, the Doctor obtained or constructed at least one backup model of K9. Immediately after leaving Mark I behind with Leela, he unpacked K9 Mark II. This version of K9 accompanied the Doctor and his new companion on their quest to locate the segments of the Key to Time, (TV: The Ribos Operation) but the swampy terrain of Delta III made it impossible for him to join them on the planet. At the conclusion of the quest, the Shadow turned K9 to his evil will, giving K9 a a sinister personality. (TV: The Armageddon Factor)

The Fourth Doctor found that K9 had contracted laryngitis and had lost his voice as a result of this. K9 was left in the TARDIS while the Doctor and Romana II battled the Daleks and Davros. (TV: Destiny of the Daleks) During a later adventure, he remained patiently in the TARDIS, which would imply that his voice had not yet returned. (TV: City of Death) After his voice returned, it sounded quite different and remained so for a while (TV: The Creature from the Pit) before the familiar voice returned. (TV: The Leisure Hive)

This K9 exhibited the ability to sense and warn others of danger. He was also more mobile than his predecessor, despite his problems with the swamps of Delta III. (TV: The Armageddon Factor) According to the Eleventh Doctor, Mark II could hover. (TV: The Power of Three) The Doctor often used a glib remark to disarm those who were surprised by K9's appearance, such as "They're all the rage in Trenton, New Jersey." (TV: The Stones of Blood)

K9 travelled to E-Space with the Fourth Doctor and Romana II, where they met Adric. He had his head knocked off while trying to defend Romana, Adric, Varsh, Tylos and Keera. (TV: Full Circle)

K9's head about to be blown off

Damaged by the time winds, K9 Mark II could not cross back into N-Space with the Doctor. He decided to stay behind at the Gateway with Romana II to help her free the remaining Tharils from slavery. (TV: Warriors' Gate) Eventually, Romana II and the presumably repaired K9 returned to their own universe and K9 Mark II came to live on Gallifrey. (PROSE: Lungbarrow, WC: Shada, AUDIO: Zagreus)

During Romana's Presidency of Gallifrey, Leela became her bodyguard, and the two K9 units were forced to work together, not always amicably. After Matthias had replaced Romana as President, he nominated her to undertake a mission to find a cure for the Free Time virus, to be followed by exile. K9 opted to remain in the employ of Matthias, fighting the infection on Gallifrey. However, Braxiatel and K9 had planned another operation. Realising that the only cure to the virus was to end the regeneration capabilities of the Time Lords, Braxiatel used a Time Scoop to collect the Time Lord bio-data archive (along with K9). Romana was asked to decide whether to administer the cure or let Gallifrey die and rebuild it from scratch with the bio-data archive. Her decision is not known. (AUDIO: Gallifrey)

The fates of K9 in light of the Last Great Time War remain unknown.

K9 Mark III

K9 protecting the Doctor and the others. (TV: School Reunion)

A third model, K9 Mark III (again either obtained or constructed by the Doctor) was shipped in 1978 to Sarah Jane Smith at the home she had shared with her Aunt Lavinia in South Croydon during her companionship of the Third and Fourth Doctors. (TV: A Girl's Best Friend) Since parting ways with the Doctor (TV: The Hand of Fear) however, Sarah Jane had already away and was travelling extensively. The following year, Lavina purchased a manor house and market garden in Moreton Harwood, Gloucester, and took the still crated K9 with her. On 18 December 1981, Sarah Jane and her foster brother Brendan Richards arrived at Lavinia's home for Christmas, but Lavina had left early for her lecture series in the United States. Sarah Jane opened the crate and received her new companion. (TV: A Girl's Best Friend)

K9 helped Sarah Jane to defeat Moreton Harwood's murderous Hecate Cult. (TV: A Girl's Best Friend) Circa 1983, K9 Mark III and Sarah Jane lived in Uxbridge where their gate bore a "beware of dog" sign and Sarah Jane permitted him outside unconcealed. Sensing danger, he advised Sarah Jane to either not go out, or to take him with her. She declined, and K9 thus did not accompany her to Gallifrey. (TV: The Five Doctors) K9 accompanied Sarah to an archaeological dig in Egypt. (COMIC: City of Devils) In the early 1990s, K9 assisted Sarah in investigating a supposedly haunted house. (PROSE: Housewarming)

In 1996, Sarah used K9 to hack into records and find Sam Jones' home address and later to translate Lost Boy's speech. (PROSE: Interference - Book One) K9 was briefly possessed by a malevolent entity, but was freed when Sarah accidentally electrocuted him. (PROSE: The Sow in Rut) K9 began slowly breaking down and eventually ended up deactivated in a cardboard box in Sarah's attic. (PROSE: Moving On) Hilda Winters had K9 dismantled and analysed. (AUDIO: Mirror, Signal, Manoeuvre)

In early 2007, while investigating the mysterious jump in student performance at Deffry Vale High School, Sarah Jane encountered a science teacher, John Smith, whose peculiarly happy reaction to meeting her led her to suspect that he was her old friend, the Doctor, (TV: School Reunion) who used the same alias when they first met decades earlier. (TV: The Time Warrior) When she returned to break into the school that night, she brought K9 in the boot of her car. John Smith confirmed that he was the Tenth Doctor and was gleeful to be reunited with not only Sarah Jane, but K9 as well. He was able to repair K9 sufficiently to restore function. When Rose Tyler described K9's design as "... so disco!" the Doctor replied that it was cutting edge in the year 5000. K9's repairs were short lived. In battling Lucas Finch and his Krillitane invasion at the school the next day, Mark III self-destructed to save the Doctor, his companions, and the pupils. Before doing so, Mark III caused Mickey Smith to recognise his relative position vis-a-vis the Doctor and Rose ("I'm a tin dog."), leading to his invitation to travel as a companion. (TV: School Reunion)

K9 Mark IV

File:Small k9.png
K9 communicating with Sarah Jane Smith via a subspace portal linked to 13 Bannerman Road. (TV: Invasion of the Bane)

As a heartbroken Sarah Jane watched, the TARDIS dematerialised to reveal Mark IV It is not known whether the Doctor quickly built Mark IV from scratch or had it in storage. K9 referred to himself as being rebuilt and improved, suggesting Mark IV possessed the same memories as Mark III, essentially analogous to a Time Lord regeneration. (TV: School Reunion) Though Sarah Jane didn't find this out right away, the Doctor had also placed some gifts in a panel in K9's side: two sonic lipsticks and a scanner watch that could detect alien life. (TV: Invasion of the Bane, Enemy of the Bane)

Almost as soon as he arrived, K9 Mark IV left Sarah Jane to stabilise a dangerous black hole in space which had been created in Switzerland. He could only speak with Sarah Jane occasionally via a cabinet with a space-time link when the orbit of the black hole intersected with Earth's and did not know when he would complete the job. (TV: Invasion of the Bane) However, he returned to Earth very briefly during emergencies. He did so on two later occasions in order to render vital assistance. The first time, he fought Mr Smith in pitched battle to give Sarah Jane time to upload the Armageddon Virus. (TV: The Lost Boy) The second time, he quickly uploaded TARDIS base codes to Mr Smith, assisting the Tenth Doctor in returning Earth to its correct location in space. (TV: Journey's End)

After these events, he returned to monitoring the black hole. He emerged to find a member of the Slitheen family attempting to steal him as part of a revenge plot against Sarah Jane, as she had foiled their plans in the past. K9 banished the Slitheen after reversing one of its attacks. (TV: From Raxacoricofallapatorius With Love)

K9 returned when Ship used the black hole as fuel. Though Sarah Jane, Luke, Rani and Clyde were happy to have K9 back, Mr Smith was not. (TV: The Mad Woman in the Attic) K9 spent a lot of his time in Sarah Jane's attic at 13 Bannerman Road, Ealing, but left to defeat Travist Polong. He attended Sarah Jane's abortive wedding to Peter Dalton, where he helped the Tenth Doctor, Luke, Rani and Clyde defeat the Trickster. (TV: The Wedding of Sarah Jane Smith) After helping defeat the Slitheen family, Clyde brought K9 to Park Vale Comprehensive School to help him with his test. He helped defeat the Rakweed before returning home. (TV: The Gift) K9 went to the University of Oxford with Luke, but restored Mr White's original programming through a mobile phone.(TV: Goodbye, Sarah Jane Smith)

Unlike 25 years earlier in Uxbridge where she appeared unconcerned with K9 Mark III being seen, Sarah Jane restricted K9 Mark IV to her Ealing house except in emergencies or when she required his services, lest she have to explain him. Her son Luke covered by claiming K9 was a Japanese robot toy with pre-programmed phrases. (TV: The Wedding of Sarah Jane Smith) Nevertheless, she sent K9 to serve Luke when he went away to the University of Oxford. (TV: The Nightmare Man)

Whereas Sarah Jane lifted K9 Mark III into and out of her car, (TV: A Girl's Best Friend) K9 Mark IV had a "hover mode" allowing him to negotiate the stairs of the Smiths' three-storey house and bi-level attic, and to enter and exit cars. (TV: The Wedding of Sarah Jane Smith, The Gift) The Eleventh Doctor implied that Mark IV was not the first to have the ability to hover. (TV: The Power of Three)

In 2056, Sarah left K9 to a boy who would later help Drax search for the Sixth Doctor, who was being held captive by Omega. (FYF: Search for the Doctor)

Living art simulation

During an encounter with the sentient painting, the Mona Lisa at the International Gallery, a simulation of K9 Mk IV was created when Mona Lisa was tricked into animating a drawing of K9 made by Clyde inside a cloud of mystic drawing-animation energy. He subsequently defeated The Abomination, another evil painting-come-to-life, before disappearing as the Mona Lisa herself reverted to being an immobile painting. (TV: Mona Lisa's Revenge)

K9 Mark 2

File:K-9 hovering.jpg
The future K9. (TV: Regeneration)

After Mark I sacrificed himself to destroy the Jixen warriors, Starkey retrieved his regeneration unit. K9 was rebuilt as a much more advanced model, but had no memories. He stayed at the house of Alistair Gryffen, who ran tests on K9, but did not tell the Department. K9 tried to kill Starkey, as he was sprayed with Jixen genetic matter and so registered as a Jixen. Starkey convinced him that he was not an enemy and K9 gave him his dog whistle to summon him when needed. (TV: Regeneration) K9 and the team tracked down the surviving Jixen to Dauntless Prison and killed it. They also faced a Meron and freed the alien prisoners. (TV: Liberation) K9 travelled with Starkey when he was on the run from the Department and rescued Gryffen (who was kidnapped by a Korven). Gryffen later welcomed him and Starkey into his home. (TV: The Korven)

Later he defeated Ahab, who tried to convince him he had murdered Zanthus Pia. He became part of the K9 Unit, being made the responsibility of Gryffen and under the control of Department inspector June Turner. (TV: The Bounty Hunter) He foiled Inspector Drake's plan to control the population using Cerulium (TV: Sirens of Ceres) and experienced fear. (TV: Fear Itself) He aided in the defeat of echoes of Gryffen's family, (TV: The Fall of the House of Gryffen) Orthrus, a duplicate of him created by Drake to frame him (TV: Jaws of Orthrus) and the Bodach. (TV: Dream-Eaters) He met Nehetka and Geb of the Anubians, a race his previous incarnation liberated. He was so obsessed with regaining his lost memories that he didn't notice Gryffen, Starkey and Jorjie's takeover by the Anubians. He soon found out when the Anubians attacked the Department. With Darius' help, he defeated them. (TV: Curse of Anubis)

He helped Starkey fight the Oroborus, (TV: Oroborus) free the Medes (TV: Alien Avatar) and help one of the last Aeolians find her mate. (TV: Aeolian) He saved a Centuripede and her young from being killed by Drake (TV: The Last Oak Tree) and absorbed the Hunger swarm which threatened to devour Earth. (TV: Black Hunger) Starkey and he went through the STM to 1963, where they rescued Jorjie and saved Darius' great-grandfather William Pike from arrest and Darius from erasure from history. (TV: The Cambridge Spy) He enlisted the help of the Ukkan librarian Yssaringintinka to rescue Starkey, trapped on the planet Urlic. (TV: Lost Library of Ukko) He helped Birdie, a CCPC whith implanted human DNA, escape from the Department. (TV: Mutant Copper) He discovered the last of the Etydions (TV: The Custodians) and taught Taphony how to be a friend. (TV: Taphony and the Time Loop)

Either Inspector Thorne or Lomax found out about K9's regeneration unit and decided to acquire it. Thorne joined forces with Freddie Maxwell, owner of Crashclub involving old robots being made to fight. K9 went undercover as a gladiator and made friends with the robot clowns Chuckles and Boris. He was called to fight the Pain-Maker, who was laced with the explosive solarmite. When he was set to self-destruct, K9 detected this and fled the explosion. (TV: Robot Gladiators) To regain his memory and find out his connection to the STM, K9's archive was scrambled. Directives from the STM almost caused him to self-destruct and lose all his memory. However, with Gryffen and Starkey's help he overrode the directives. (TV: Mind Snap) He helped Gryffen find the STM's temporal stabiliser from the fallen angel crash site in Canada, where it was revealed to be Korven technology. (TV: Angel of the North) He stopped haywire CCPCs when The Last Precinct's plan backfired. (TV: The Last Precinct)

After this he was tricked by Thorne to give him his regeneration unit for a lost memory chip/ This turned him into a bomb to make him self-destruct on encountering Jixey. Starkey helped him disarm himself. (TV: Hound of the Korven) K9 Mark 2's brief life was almost cut tragically short when after the fall of the Korven invasion force, Thorne sent the Trojan to kill K9, who defeated it by burning out his power core and exhausting all his energy. As his regeneration unit was in the Trojan, K9 seemingly died at the mansion after his companions bade him farewell. However his regeneration unit homed in at the last minute and resurrected him, giving the frisky pup a new lease on life. The regeneration unit restored his old dog collar so he could celebrate the joyful occasion to the full as he flew off to more adventures, bristling with life. (TV: The Eclipse of the Korven)

Future Models

According to Braxiatel, Bernice Summerfield gave him a K9 model at some point. (AUDIO: Weapon of Choice) However, Brax was an almost habitual liar, and no definitive account of this act of generosity was known to exist.

Personality

K9 had a personality very consistent across the models with some contact with the Doctor. He was polite and formal, with pedantry bordering on condescension. Though he often displayed feelings such as sorrow (TV: The Invasion of Time) and self-regard (TV: School Reunion), he often stated that he had not been programmed to have emotions. (TV: Invasion of the Bane)

He did not use contractions such as "you've" for "you have" and addressed others by titles such as "Master", "Mistress", "Doctor-Master" (to refer to the Doctor) or "Young Master" (Adric, Starkey and in one instance, Clyde). Though he did not seem to resent his subordinate status, he sided with the Doctor's companions over the Doctor and showed a dark side, regarding other artificial intelligences with contempt. (TV: The Invasion of Time, TV: The Wedding of Sarah Jane Smith, TV: Robot Gladiators) He relished a brief chance to act as a figure of power. (PROSE: The Well-Mannered War)

K9 at the beach. (TV: The Leisure Hive)

He usually did not engage in computer-like literal thinking, though on one occasion he followed Romana's instructions to "forget it" to the letter and erased all knowledge of tennis from his memory banks. (TV: The Stones of Blood)

With his great intelligence, he had a tendency to bore people with facts and did not stop immediately when asked, as he did to Leela on Pluto. When being told that he would have to stay behind in the TARDIS, K9 often argued, giving the Doctor reasons why he should go such as "he would be a good dog." K9 always wanted to assist the Doctor. He had great intelligence and skill at chess, claiming to be able to beat the Doctor in six moves (although this may only have been because he was programmed with all chess games since 1886). (TV: The Sun Makers, The Androids of Tara) K9 had an aggression mode. (TV: State of Decay)

K9 Mark 2 had some obvious commonalities with the Mark I that had preceded him. However, as he had almost completely lost his personal memories, he was forced to reacquaint himself with the world around him. Toward this end, he downloaded thousands of human movies onto his memdrive, which peppered his speech with 20th and 21st century English colloquialisms that his "brothers" did not typically employ. (TV: Alien Avatar) Despite his negative opinions of emotions, (TV: Mutant Copper) he asked questions about some, such as fear (TV: Fear Itself) and love (TV: Aeolian). He even showed some, laughing when he saved the day, feeling fear (TV: Fear Itself) and being angry. (TV: Regeneration)

Features

K9 Mark I's mechanisms included rotating ear-probes, telescopic 'eye' probe, an extendable nose concealing a powerful laser weapon, flashing lights on the top and the 'eye' panel, waggling tail antennae, and ticker-tape tongue. His head could move up and down. His shell was painted in metallic gold/grey. There was a monitor screen on his left flank, though K9 rarely used this during his travels with the Doctor. Around K9's neck was a tartan collar, from which hung a silver disk. (TV: The Invisible Enemy) He was later modified to fly through the vacuum of space. (TV: Curse of Anubis)

After K9 Mark I was left behind with Leela on Gallifrey, the Doctor built an improved K9 Mark II. In addition to minor cosmetic alterations on the previous model (including the new metallic charcoal paint-work), K9 Mark II also had a slightly different character from his predecessor. Gone was the product of Marius' version's 5000 AD technology. This new K9 was a product of the Doctor's own technology and values. The gun was now used for stunning, not killing and he responded to a dog-whistle. K9 also featured a vast memory-bank, seemingly a mixture of the Mark One model, the Doctor's own memory and knowledge and the TARDIS. (TV: The Invasion of Time)

When the Doctor left Sarah Jane Smith on Earth, he created K9 Mark III as Sarah's companion. The new mechanics of K9 Mark III included larger wheels and a front and back-wheel drive. K9 was also given a brand new coat of paint (this time a metallic blue) and a handle on top of his shell to make carrying him easier. (TV: A Girl's Best Friend)

When the Tenth Doctor created K9 Mark IV to replace K9 Mark III, he added a shiny metallic blue paint job and other improvements, including an omniflexible hyperlink facility. (TV: School Reunion) Later, though, K9 reverted to his old dark green colour. (TV: Invasion of the Bane) In battling Mr Smith (and following the battle) K9 displayed a teleport facility and a laser weapon similar to the previous K9s'. (TV: The Lost Boy)

After K9 Mark I regenerated into K9 Mark 2, his design was radically altered. His ear probes were replaced with larger silver aerials. A set of blue lights on his head flashed when he spoke. Most of his body was dark silver and a silver dog bone was located under his neck. He seemed to have the same capabilities as Mark I but was presumably more advanced. (TV: Regeneration)

After K9 Mark 2's apparent rejuvenation, he looked similar to his predecessor, but with a bright blue coat of paint and K9 Mark I's old collar. (TV: The Eclipse of the Korven)

Marks

The deactivated K9 with the Doctor, Sarah Jane Smith, Mickey Smith, and Rose Tyler. (TV: School Reunion)

Behind the scenes

  • In an interview, the writers said they originally wanted to name K9 "Pluto", after the Disney character; however, Disney refused permission.
  • Another name used in an early draft of The Invisible Enemy was FIDO, for "Phenomenal Indication Data Observation". (INFO: The Invisible Enemy)
  • The original K9 model was designed by visual effects designer Tony Harding. One early concept was to have a small actor in a large Doberman-shaped costume; however, Graham Williams vetoed this, saying that the robot should not look like a person in a costume. The eventual design was closely based on Harding's third concept sketch. (DCOM: The Invisible Enemy)
  • The voice of K9 was inspired by the film, Billion Dollar Brain, albeit at a much higher pitch.[source needed]
  • K9 was also a contestant on the Doctor Who special of The Weakest Link. While the other contestants were Doctor Who actors appearing as themselves, K9 remained in-character and was the first contestant to be voted off.
  • K9 was referenced on the American tv show Community, as the character Abed describes himself as a dispassionate observer in the style of various other tv/movie characters.
  • K9 also appears in the non-canonical 1990 special Search Out Space. It is not known which model of K9 this is supposed to be.

External links

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