Adam Mitchell Adam Mitchell was a young English researcher in the employ of the American GeoComTex billionaire Henry van Statten in the year 2012 . After van Statten was outed from GeoComTex for the " Metaltron " incident , Adam become a companion to the Ninth Doctor , at Rose Tyler ' s urging . However , Adam disgraced himself by filching information from the future with intent to alter his timeline , and the Doctor spurned Adam from accompanying him any further . Years after being abandoned by the Doctor , Adam plotted to kidnap various companions from multiple incarnations of the Doctor with . However , when the Master made a plot to destroy the universe , Adam sacrificed his life to stop him , and was buried with honours . Biography . Meeting the Doctor . Adam was a genius who had successfully hacked into the United States Department of Defense computer s when he was eight years old , nearly causing , in his own words , World War III . He was recruited by van Statten to work for GeoComTex . The Ninth Doctor and Rose Tyler met Adam in the year 2012 . At the time he worked in van Statten ' s Vault in Utah , where he catalogued extraterrestrial artefacts for his employer . When the Dalek van Statten had " collected " got loose and went on a rampage , Adam found himself running from it with Rose . He told Rose that he had always wanted to see the stars ; she asked the Doctor to take Adam along with them in the TARDIS . Rose also found Adam attractive . Despite the Doctor ' s scepticism about Adam as a potential fellow traveller , he agreed . ( TV : " Dalek " ) The Doctor initially attempted to return Adam home but found the TARDIS knocked slightly off course by a temporal tsunami as they arrived in Birmingham 2012 . At first , Adam initially was of little help , only attempting to impress Rose and quickly assuming the Doctor was gone for good when he was dragged into the past by the Bygone Horde , trying to get her to come to terms with the fact ; indeed , he only began looking for answers when Rose was taken by the same forces , and was somewhat dismayed when he received a phone call from Rose ' s number but heard the Doctor ' s voice instead . Nevertheless , Adam would demonstrate his worth as a companion when he proved invaluable in defeating the Horde , leading the Doctor to warmly compliment him and decide to take him on as a companion alongside Rose as he set a course for the far future . ( AUDIO : " The Other Side " ) Nevertheless , Adam ' s travels with the Doctor and Rose would not last long . Visiting the year 200 , 000 , Adam was overwhelmed by the wealth of information and technology available to him and immediately gave in to temptation and greed . Desperate to gain all the information that the Fourth Great and Bountiful Human Empire had collected , he learned that only those with an implant could access the data . He had a top - of - the - line computer interface port , an infospike , installed in his head . When the implant activated to access computers , his head opened up , revealing part of his brain . The implant was activated by a snap of the fingers . He tried to transmit information back to 21st century Earth with Rose ' s superphone . When Adam tapped into the computer systems , he inadvertently gave the Jagrafess knowledge of — and nearly access to — the TARDIS . One of Satellite Five ' s journalists , Cathica , freed Adam , prevented the Jagrafess from obtaining the TARDIS key and vented heat to Floor 500 , killing it . Learning of Adam ' s transmission of information and his additional breach of trust , the Doctor angrily returned Adam to his home , who weakly tried to pin his mistakes on the Doctor being the one in charge , which quickly turned to apologetic pleading . The Doctor destroyed the answering machine which had received the information from the future , after Adam attempted to lie about it . He observed that Adam would have to live a quiet life , lest someone discover the implant in his head and dissect him to find out where it came from . After the Doctor and Rose left , Adam was met by his mother who , when talking to him , clicked her fingers . As his head opened up , a look of shock and horror appeared on her face . ( TV : " The Long Game " ) At some point , Adam was taken to the Black Archive by UNIT to have his record as a companion of the Doctor taken . His memories of the visit were subsequently erased and he was sent on his way . ( TV : " The Day of the Doctor " ) Revenge . Adam ' s mother died shortly after the Doctor left Adam on Earth , and Adam became angry at the Doctor for erasing the technology that could have saved her . Adam spent years doing nothing with his life , seeing the Doctor and Rose pop up throughout history without him . He eventually decided to use the technology in his head to steal from corporate accounts , giving him the means to have his revenge . Adam excavated Van Statten ' s vault , and used Cyberman technology to lure out a Time Agent and steal his vortex manipulator , giving him access to time travel . Adam searched the universe for various enemies of the Doctor that he could use against him in his battles . One of the first he found was , whose evil he underestimated . Adam soon learnt of the Doctor as a Time Lord and his ability to regenerate , discovering his eleven known incarnations of his first regeneration cycle . He then set out to capture the companions of these Doctors . He used memory distortion to prevent the Doctor from remembering him , but this grew weaker as he came closer and closer to the Doctor who he had betrayed . ( COMIC : " Mystery Date " ) Working with the Animus and the Zarbi , he was successful in capturing the First Doctor ' s companions Barbara Wright , Ian Chesterton and Vicki Pallister . ( COMIC : " Unnatural Selection " ) Manipulating a T - Mat machine , he captured the Second Doctor ' s companions Jamie McCrimmon and Zoe Heriot . ( COMIC : " Bazaar Adventures " Using a vortex manipulator , he appeared in front of the Third Doctor , grabbed the Doctor ' s companions Liz Shaw , Sarah Jane Smith and the Brigadier and teleported away . ( COMIC : " In With the Tide " ) Once again using the vortex manipulator , he appeared in front of the Fourth Doctor and kidnapped Leela and K9 Mark I . ( COMIC : " A Rare Gem " ) Using the vortex manipulator , he appeared in front of the Fifth Doctor and kidnapped Tegan , Nyssa , and Adric . However , the Doctor was at that point able to remember the other times he ' d met Adam . ( COMIC : " In Their Nature " ) Working with the Master , he then kidnapped Peri from the Sixth Doctor . ( COMIC : " Façades " ) However , this was a trap set up by the Tenth Doctor . Instead of kidnapping Peri , Adam had kidnapped Frobisher , who quickly used his shape - shifting abilities to escape his confinement . ( COMIC : " Endgame " ) The Seventh Doctor encountered the Master and defeated him , but , as he said his goodbyes and watched the Master run , Adam captured Ace . ( COMIC : " Cat and Mouse " ) The Eighth Doctor anticipated Adam ' s arrival , but was helpless to prevent Grace Holloway from being kidnapped . ( COMIC : " The Body Politic " ) He met the Ninth Doctor and finally revealed his true identity . Finally meeting the incarnation that he felt betrayed him , Adam vented his anger and explained his plans for revenge and how he has wasted his life . When the Doctor was unsympathetic to his plight , he struck the Doctor down , kidnapping Rose in the process . ( COMIC : " Mystery Date " ) The Tenth Doctor realised Adam ' s presence the moment he arrived , but couldn ' t prevent him from kidnapping Martha . ( COMIC : " Quiet on the Set " ) Adam then quickly attacked the Eleventh Doctor and kidnapped Clara . The Eleventh Doctor found Adam had taken all the alien technology from Van Statten ' s vault . He found the Time Agent Adam captured and gained the means to track Adam ' s Vortex Manipulator . He got to Adam ' s Fortress in Limbo and found all his companions in stasis . Adam then threatened to kill all the Doctor ' s companions , saying the Doctor could only save one . ( COMIC : " The Choice " ) It was then that a mixed form of various TARDISes from each Doctor materialised , out of which appeared the other ten Doctors . Under the orders of the Master , Adam released an army of Autons at them . Frobisher , meanwhile , released all of the Doctor ' s companions , all of which began attacking the Autons . The Master then revealed the Auton attack as a distraction , as he blasted the rest of the chronal energy he had drained into the Doctor ' s TARDISes . This would cause all of them to overload , which would destroy all of them and the Doctors at the same time and thus destroying the universe as well . Adam , deciding that he did not want the Universe destroyed and realising he had been used by the Master , fought back against him . He attacked the Master , who hit him back with a sharp object , injuring him . Then , Adam blasted the computer in an explosion that engulfed him . During his last moments , he apologised to the Doctor , and told Rose he understood why the Doctor ' s companions were so willing to risk themselves for him . The Doctors and his companions buried him outside his time palace , with the inscriptions " Adam Mitchell , A Companion True . " ( COMIC : " Endgame " ) Behind the scenes . Companion status . The " disregarded companion " , Adam Mitchell , is the only companion from the revived series up to that time not included in " Journey ' s End " , the finale to Series 4 of " Doctor Who " . Adam is also the only companion to be kicked off the TARDIS just one episode after joining the Doctor . Adam is the only known companion to be actually expelled from the TARDIS crew for bad behaviour . However , Rose nearly became the second companion to be expelled in " Father ' s Day " , as did Amy Pond in " The Beast Below " . Adam is one of two television companions , the other being Harry Sullivan , who had no on - screen scenes in the TARDIS interior . He is seen entering and emerging from the TARDIS several times , but he is never seen within the TARDIS itself . Peculiarly , Adam is the first companion in the BBC Wales version of " Doctor Who " to be unambiguously killed off in a medium other than the one he was first introduced in ; namely , televised stories . Furthermore , with his death and final sacrifice , he is vindicated and recognised as a companion by the Doctor .