Voiced by: John Leeson/David Brierly
Tenure 1 Octobner 1977-12 November 1981
First appearance The Invisible Enemy (regular)
Last appearance K9 and Company (regular)
Last appearance Sarah Jane Adventures
Last appearance K9 (TV Series)
Number of series 2 1/2
Appearances 20 stories
source TARDIS Wikia
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. (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. (Tautology)
The Professor offered K9 to the Fourth Doctor as the same weight requirements made him unable to take Mark I back to Earth. (The Invisible Enemy) After adventures with Leela and the Doctor, Mark I decided to stay on Gallifrey with his “mistress”. (The Invasion Of Time).
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. (The Ribos Operation) It is possible that the Doctor spent some time at Nest Cottage before activating him. (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)
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. (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. (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. (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, (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 sinister personality. (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. (Destiny Of The Daleks) During a later adventure, he remained patiently in the TARDIS, which would imply that his voice had not yet returned. (City of Death) After his voice returned, it sounded quite different and remained so for a while (The Creature from the Pit) before the familiar voice returned. (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. (The Armageddon Factor) 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.” (The Stones of Blood)
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. (Warriors’ Gate) Eventually, Romana II and the presumably repaired K9 returned to their own universe and K9 Mark II came to live on Gallifrey. (Lungbarrow, Shada, 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. (Gallifrey)
The fates of K9 in light of the Last Great Time War remain unknown.
K9 MARK III
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. (A Girl’s Best Friend) Since parting ways with the Doctor (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. (A Girl’s Best Friend)
K9 helped Sarah Jane to defeat Moreton Harwood’s murderous Hecate Cult. (A Girl’s Best Friend) Circa 1983, K9 Mark III and Sarah Jane lived in semi-detached house 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. (The Five Doctors) K9 accompanied Sarah to an archaeological dig in Egypt. (City of Devils) In the early 1990s, K9 assisted Sarah in investigating a supposedly haunted house. (Housewarming)
In 1996, Sarah used K9 to hack into records and find Sam Jones‘ home address and later to translate Lost Boy’s speech. (Interference – Book One) K9 was briefly possessed by a malevolent entity, but was freed when Sarah accidentally electrocuted him. (The Sow in Rut) K9 began slowly breaking down and eventually ended up deactivated in a cardboard box in Sarah’s attic. (Moving On) Hilda Winters had K9 dismantled and analysed. (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,
(School Reunion) who used the same alias when they first met decades earlier. (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. (School Reunion)
K9 MARK IV
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. (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. (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. (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. (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. (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. (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. (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. (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. (The Gift) K9 went to the University of Oxford with Luke, but restored Mr White’s original programming through a mobile phone.(Goodbye, Sarah Jane Smith)
Unlike 25 years earlier 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. (The Wedding of Sarah Jane Smith) Nevertheless, she sent K9 to serve Luke when he went away to the University of Oxford. (The Nightmare Man)
Whereas Sarah Jane lifted K9 Mark III into and out of her car, (A Girl’s Best Friend) K9 Mark IV had a “hover mode” allowing him to negotiate the stairs of the Smiths’ three-story house and bi-level attic, and to enter and exit cars. (The Wedding of Sarah Jane SmithThe Gift) The Eleventh Doctor implied that Mark IV was not the first to have the ability to hover. (The Power Of Three)
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. (Mona Lisa’s Revenge)
K9 MARK 2
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. (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. (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. (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. (The Bounty Hunter) He foiled Inspector Drake’s plan to control the population using Cerulium (Sirens of Ceres) and experienced fear. (Fear Itself) He aided in the defeat of echoes of Gryffen’s family, (The Fall of the House of Gryffen) Orthrus, a duplicate of him created by Drake to frame him (Jaws of Orthrus) and the Bodach. (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. (Curse of Anubis)
He helped Starkey fight the Oroborus, (Oroborus) free the Medes (Alien Avatar) and help one of the last Aeolians find her mate. (Aeolian) He saved a Centuripede and her young from being killed by Drake (The Last Oak Tree) and absorbed the Hunger swarm which threatened to devour Earth. (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. (The Cambridge Spy) He enlisted the help of the Ukkan librarian Yssaringintinka to rescue Starkey, trapped on the planet Urlic. (Lost Library of Ukko) He helped Birdie, a CCPC whith implanted human DNA, escape from the Department. (Mutant Copper) He discovered the last of the Etydions (The Custodians) and taught Taphony how to be a friend. (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. (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. (Mind Snap) He helped Gryffen find the STM’s temporal stabiliser from th efallen angel crash site in Canada, where it was revealed to be Korven technology. (Angel of the North) He stopped haywire CCPCs when The Last Precinct’s plan backfired. (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. (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. (The Eclipse of the Korven)
According to Braxiatel, Bernice Summerfield gave him a K9 model at some point. (Weapon of Choice) However, Brax was an almost habitual liar, and no definitive account of this act of generosity was known to exist.
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 (The Invasion Of Time) and self-regard (School Reunion), he often stated that he had not been programmed to have emotions. (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. (The Invasion Of Time, The Wedding of Sarah Jane Smith, Robot Gladiators) He relished a brief chance to act as a figure of power. (The Well-Mannered War)
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. (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).
(The Sun Makers, The Androids of Tara) K9 had an aggression mode. (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. (Alien Avatar) Despite his negative opinions of emotions, (Mutant Copper) he asked questions about some, such as fear
(Fear Itself) and love (Aeolian). He even showed some, laughing when he saved the day, feeling fear (Fear Itself) and being angry. (Regeneration)
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, (being the Family Tartan of the Clan Buchanonn) from which hung a silver disk. (The Invisible Enemy) He was later modified to fly through the vacuum of space. (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. (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. (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. (School Reunion) Later, though, K9 reverted to his old dark green colour. (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’. (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. (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. (The Eclipse of the Korven)
- 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. (The Invasion Of Time) Some time later, he was blown up by a bomb on Gallifrey, (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. (Regeneration)
- K9 Mark II was created by the Fourth Doctor as a “backup” when it became obvious that the Mark I was becoming erratic. (The Time Vampire) He was left behind with Romana II in E-space, (Warriors’ Gate; The Choice, The Search) and apparently made it back to Gallifrey when she became Lady President of the High Council. (Shada)
- K9 Mark III was a gift from the Doctor to Sarah Jane Smith (A Girl’s Best Friend). He sacrificed himself to save Deffry Vale High School from Krillitanes. (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. (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.
(Regeneration, The Bounty Hunter)
- Orthrus was an attempt by Drake and the Department to replicate K9, but it was of vastly inferior design. (Jaws of Orthrus)
BEHIND THE SCENES
- K9 is a real world acronym of canine, used to refer to working dogs in the police and military.
- 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”. (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. (The Invisible Enemy)
- The voice of K9 was inspired by the film, Billion Dollar Brain, albeit at a much higher pitch.
- 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.
- K9’s bodywork is made of lanthanum. This fact was stated when he appeared on a Doctor Who addition of “Pointless Celebrities”.
K9 was damaged when he tried attacking some Wrarth Warriors. He was left on board the TARDIS for repairs, during which time he believed he was Leela, and later, a cat. When the Wrarth Warriors arrested Beep the Meep, K9 hissed at Beep. (Doctor Who and the Star Beast)
The Doctor repaired K9. When the Doctor attempted to return Blackcastle resident Sharon Davies home, they instead ended up in the space freighter the Spacehog in the New Earth System. K9 stunned a group of attacking Werelox with his nose beam on board the ship, who were then tranquillised. The Doctor was infected by the venom of a Werelok claw and began transforming into a Werelok. He brought K9 into the TARDIS, and hauled the ship out of time and space. He spent three months in the TARDIS laboratory devising a cure, while K9 was under orders to stun the Doctor every time he tried to return to the controls. When the Doctor and K9 returned, only ten minutes had passed on board the Spacehog.
The Daleks had used the Werelox as an army to attack the planets of the New Earth System so they could sterilise life there and breed a super race of Daleks in the system out of the qualities of the zoo creatures they kept on board the Dalek battlecraft. When the Doctor was captured on board the battlecraft, K9 released the captured zoo aliens, causing them to attack their Dalek captors. After discovering the Room of the Many Centuries, the Doctor escaped to the TARDIS to materialise the ship inside the room. When K9 and the hypnotised Werelok Brill cleared the secured room of Daleks, the Doctor disconnected the time-space rationaliser of the time transporter, freezing the Daleks in one moment in space and time forever. Sharon decided to continue travelling with the Doctor before returning to Blackcastle. (Doctor Who and the Dogs of Doom)
K9 was separated from the Doctor and Sharon by a split in the fabric of space and time that split the TARDIS in two. He reunited with the Doctor and Sharon, both of whom were aged four years by a malfunctioning chrono-compensator, when the two halves of the TARDIS were brought back together. (Doctor Who and the Time Witch)
After landing on Barclow, he was given constitutional privilege after trying to warn Rabley about the incoming bomb. Subsequently, he became a presidential candidate. He went to Metralubit to run his campaign. He developed an economic policy that would be populist but not raise taxes. During his campaign, the population of Metralubit started rioting. He was affected when Menlove Stokes destroyed the Femdroids’ central processor. Shortly afterwards, with the help of Romana, he realised that Galatea was based on him. (The Well-Mannered War)
K9 was left inside the TARDIS when the Doctor and Romana went punting in Cambridge to meet Professor Chronotis. After several hours of being “nowhere”, (Shada) due to the Doctor and Romana being taken out of time by Borusa, (The Five Doctors) the Doctor went back to the TARDIS, demanding everyone to put their bathing suits on as they were going to Brighton. The Doctor and Romana, though retaining memories of the punting trip, had forgotten they intended to visit Chronotis. The Doctor said that they had intended to be back “before lights out”, but “went on somewhere else”, according to Romana, after only being away from the TARDIS for two hours and twenty-one minutes. (Shada)
Mark II was repaired. He accompanied Romana when she returned to N-Space. During Romana’s term as President of Gallifrey, K9 Mark II served as her aide and advisor. (Lungbarrow)
Remembering he had intended to visit his friend, Professor Chronotis in 1979 Cambridge back in the days his fourth incarnation travelled with Romana II, (Shada) before he and Romana were taken out of time by Borusa for several hours, (The Five Doctors) the Eighth Doctor came to Madame President Romana and K9 on Gallifrey to investigate what he was supposed to have been doing before his fourth incarnation, annoyed he was “nowhere” for several hours, forgot and went off to Brighton.
K9 was able to trace the sphere that attacked the Doctor to the ship of Skagra. The Doctor, Chris Parsons, Romana and K9 travelled to it. Chris and K9 were imprisoned in the ship’s brig until the Doctor could release them. When the Doctor’s meddling on board Skagra’s ship awoke a Krarg, K9 bought time for the Doctor and Chris by fighting it off. The Krarg attacked Think Tank and destroyed its systems.
Using The Worshipful and Ancient Law of Gallifrey as a “key”, Skagra took Romana with him to the Time Lord prison planet, Shada, to take the mind of the criminal, Salyavin, to make all inhabitants of the universe share Skagra’s mind. Discovering Chronotis’ TARDIS on board Skagra’s command ship, the Doctor chased after him. After arriving, Skagra stole the mind of the Professor, who was actually Salyavin. Skagra began placing fragments of the minds he had stolen into his Krarg servants.
As Skagra left Shada in the Doctor’s TARDIS, the Doctor created a tunnel to link the two TARDISes in the time vortex together. This broke Chronotis’ TARDIS. However, K9 was able to help repair it. The Doctor arrived through the TARDIS’ “back entrance” and improvised a mind control helmet to command the Krargs, as part of the shared mind contained the Doctor’s own thoughts. After the TARDIS landed on Skagra’s command ship, the conflicting commands from the Doctor and Skagra destroyed the Krargs, the surviving victims whose minds were taken by the sphere returning to their bodies. The Doctor and Romana ordered K9 to shoot at the Krarg commander, leading it towards the vats of unborn Krargs, destroying it and the vats. (Shada)
K9 was also equipped with a stealth mode. However, he did not use it until boarding the space platform Fortune II in the Proxima System, as “no one ever asked.” (The Final Phase)
According to another account, K9 stayed in the family for generations until he was inherited by a stockbroker named Frank in 4997. Since neither Frank nor his fiancée Gloria were mechanically-minded, they decided to give it to Gloria’s uncle, Professor Frederick Marius. The professor was amazed when examined the old machine, its technology being far in advance of the 20th century. However, Marius was forced to have it scrapped rather than take it with him to the Bi-Al Foundation due to shuttle weight restrictions. He watched as K9 was destroyed, compacted into a tiny metal square. He kept the motherboard as a memento, and later used it as the basis of a new computer which he had constructed at the Foundation, naming it K9 as well… (Tautology)
Mark III included some improvements over past models. The new mechanics of K9 Mark III included larger wheels and a front and back-wheel drive. K9 also had a brand new coat of paint (this time a metallic-blue), (A Girl’s Best Friend) though over time, Mark III rusted to some extent. The paint on his metal casing had faded and chipped away a bit by the time she brought him to the Tenth Doctor to restore some of his functionality. (School Reunion) Mark III also had a handle on the top of the shell to make carrying him easier. (A Girl’s Best Friend) Although Sarah Jane indeed carried K9 Mark III to load him into and out of her car, (A Girl’s Best Friend) the Eleventh Doctor later implied that Mark IV was not the first to be capable of hovering. (The Power Of Three)
K9 claimed that he was shaped like a dog because “the human ego requires a familiar reference point to aid in adjusting to new concepts. Animal forms are comforting to the majority of humans.” (Housewarming)
K9 ran on an electron-fusion nuclear battery. Though K9 usually recharged himself when necessary, Sarah Jane had occasionally done so by clipping jump leads to his antennae. (Housewarming)
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