Adric Adric was a companion to the Fourth and Fifth Doctor s . An inhabitant of E - Space , he only entered N - Space by means of his travelling with the Doctor . With his Elite status for mathematics , Adric brought an additional academic know - how to the TARDIS ' s crew . He was killed whilst trying to stop a freighter from crashing into a prehistoric Earth , which in turn caused the mass extinction of the dinosaurs . ( TV : " Earthshock " ) . Adric ' s travels were primarily alongside Nyssa and Tegan Jovanka , although he did spend some time with Romana and K - 9 . His friendship with the girls was so strong that they were deeply affected by his death , leading to Tegan temporarily leaving the Doctor ' s company . Nyssa later named her son after Adric . Biography . Early life on Alzarius . Adric was an Alzarian born on the planet Alzarius in the parallel universe of E - Space in the 32nd century . His parents Morell and Talisa died in a forest fire when he was young , leaving him and his brother to fend for themselves . ( AUDIO : " The Invasion of E - Space " , " A Full Life " ) He was ranked as an elite and was awarded a blue star - shaped badge with gilt edging for mathematical excellence . His older brother Varsh belonged to a gang of teenage thieves . Adric wanted to join them , but was refused . Varsh asked him the embarkation question : " Where will you be when the starliner leaves Alzarius ? " Adric replied that he would be somewhere else entirely . This proved to be true ; he was on board the TARDIS when it took off . To prove himself to the gang , he tried to steal some riverfruit , but failed . ( TV : " Full Circle " ) E - Space adventures . Adric stowed away on the TARDIS and was discovered by the Fourth Doctor and Romana II . He pretended to share the agenda of the Three Who Rule , a trio of vampire s who ruled over a small community . He tried to save Romana from being sacrificed but failed ; both were saved by the Doctor . ( TV : " State of Decay " ) After Romana . After Romana left , Adric and the Doctor travelled together . They left E - Space and entered the Doctor ' s universe . ( TV : " Warriors ' Gate " ) Soon after , they went to Traken and met Nyssa . They saved Traken from and returned the Keepership to its rightful heir . ( TV : " The Keeper of Traken " ) He greatly missed Romana and K9 after their departure . ( AUDIO : " Psychodrome " ) The Doctor assembled another version of K9 , who joined them on their journeys . ( PROSE : " Inter - Galactic Cat " , " Conundrum " , " Planet of Paradise " , " Plague World " , " Just a Small Problem " ) At some point before the Fourth Doctor ' s attempt to fix the TARDIS ' chameleon circuit , ( TV : " Logopolis " ) he sent this K9 to Sarah Jane Smith , care of her Aunt Lavinia . ( TV : " A Girl ' s Best Friend " ) Adric and the Doctor encountered again shortly after leaving Traken . The Doctor made plans to use the mathematical skills of the Logopolitan s to repair the faulty TARDIS chameleon circuit . They met Nyssa again , as well as Earth stewardess Tegan Jovanka , both of whom joined them on their travels . Although they again defeated the Master , the Doctor was badly injured . All three companions watched him regenerate . ( TV : " Logopolis " ) With the Fifth Doctor . Immediately after the Doctor ' s regeneration , the Master kidnapped Adric and held him in the Hadron web . The Master planned to use Adric ' s mathematical prowess to produce his own version of Block Transfer Computation s . With this power , the Master made the town of Castrovalva as a trap for the Fifth Doctor . However , the Doctor saw through the Master ' s plan and rescued Adric . Without Adric in the web , the city began to collapse . The Doctor , Adric , Tegan and Nyssa escaped , while the Master seemed to be destroyed in the city . ( TV : " Castrovalva " ) Adric ' s relationship with the Doctor deteriorated after the Fourth Doctor regenerated and Tegan and Nyssa began travelling in the TARDIS . ( TV : " Logopolis " , " Castrovalva " ) He told Tegan that he understood the mathematics that created the TARDIS soon after there was some turbulence . Upon searching for the source of the Time Disturbances , he encountered Roz Forrester . He was then taken to the Scientific building for questioning . To allow the Doctor and Patience to escape , he stayed behind to face the adjudicators who was in fact Roz . He encountered the Seventh Doctor and helped in his plans . ( PROSE : " Cold Fusion " ) Adric believed the girls were a hindrance to his relationship with the Doctor . He also had a clear preference for the Fourth Doctor . ( PROSE : " Divided Loyalties " , TV : " Earthshock " ) While visiting Cranleigh Hall in Buckinghamshire on 11 June 1925 , Adric attended the fancy dress party thrown by Lady Madge Cranleigh and her son Charles Cranleigh , wearing a pirate costume . ( TV : " Black Orchid " ) During the party , he briefly met the Seventh Doctor ' s companion Ace , who was searching for one of the segments of the Key to Time , and began to flirt with her . However , Ace was not receptive to his advances and threatened to give him a permanent limp if he continued . ( COMIC : " Time & Time Again " ) On one occasion , the Doctor , Adric , Nyssa and Tegan spent Christmas with the renegade Time Lady Iris Wildthyme aboard the TARDIS . Iris was fond of Adric and was devastated to hear of his untimely death . ( AUDIO : " Excelis Dawns " ) Death . Adric was often fiercely competitive , yet frustrated by his clumsiness as he struggled to find a useful role in the TARDIS crew . He finally told the Doctor that he wanted to return to E - Space . After showing the Doctor his computations to engineer the return , Adric admitted he really wished to remain on the TARDIS . He was caught up in a failed plan of the Cybermen to bombard the Earth with Briggs ' freighter in 2526 , while the Doctor and his companions were stuck on the TARDIS with the Cyber - Leader who , upon learning that his attempt to destroy the human race had in fact made its evolution possible in the first place , decided to kill the time travellers to prevent them from enjoying their victory . The Doctor took Adric ' s star badge and rubbed its gold edge into the chest unit of the Cyber - Leader , fragmenting the badge in the process . In a panic , the dying Cyber - Leader fired its gun wildly , blasting the TARDIS console with one of its wayward shots . The Doctor wrested the gun from the Cyberman and killed it , but the damage to the TARDIS console made it impossible to operate and go after Adric . On his own , Adric , who had been made to stay on the freighter by the Cyber - Leader , attempted to steer the spaceship away from the Earth , but a wounded Cyberman quietly limped into the control room and opened fire on him before it succumbed to its injuries . While the Cyberman missed Adric , it destroyed the freighter control system , making it impossible for Adric to change the freigther ' s course . Adric resigned himself to his fate and clutched his fallen brother ' s sash never knowing whether he was right . With Adric on board the freighter , having travelled backwards in time due to the Cybermen ' s interference , crashed into prehistoric Earth , causing the extinction of the dinosaur s . Nyssa and Tegan wept at his loss , while the Doctor was at a loss for words over his failure to save a close friend . ( TV : " Earthshock " ) Legacy . An illusion of Adric appeared to Nyssa and Tegan to dissuade them from entering Kalid ' s inner sanctum , warning them to turn back or they would destroy him . The girls thought at first this was the real Adric , until they noticed the illusion was wearing Adric ' s by - now - destroyed star - shaped badge . ( TV : " Time - Flight " ) Adric ' s death led the Doctor to swear that he would not allow any of his other companions to die during his fifth incarnation . ( PROSE : " Goth Opera " ) Just before he regenerated , the last word the Fifth Doctor said was " Adric ? " ( TV : " The Caves of Androzani " ) Adric ' s death haunted the Doctor for many years . His tenth incarnation watched Adric die again — this time as a manifestation of the TARDIS Matrix . ( COMIC : " The Forgotten " ) Nyssa named her only son Adric in his honour . He had one older sister named Neeka . ( AUDIO : " Heroes of Sontar " ) On Adeki , the Seventh Doctor found what appeared to be Adric , along with other former companions , alive again and desperate to leave in the TARDIS . He learned that these were actually Gwanzulum s , a race of shapeshifter s . ( COMIC : " Planet of the Dead " ) While in the Divergent Universe , the Eighth Doctor was shown an illusory version of Adric by the Kro ' ka . ( AUDIO : " The Last " ) It infuriated the Tenth Doctor when the Advocate used Adric ' s death against him in order to estrange him from his companions . ( COMIC : " Tesseract " ) Alternate history . In an alternate version of these events , after the Fifth Doctor interfered to try to recover his TARDIS after it was stolen by Thomas Brewster , his sub - consciousness helped Adric break the final logic code on the Cybermen ' s computer . This let Adric land — and survive — on Earth . Adric created a City of Excellence and ruled over a sentient race of scorpions which evolved in place of the dinosaurs . Adric created and sustained this world with Block Transfer Computations . The computations also extended Adric ' s life far beyond its natural length . Five hundred years later , Adric met the Doctor and Nyssa . He accompanied them back to the Victorian era . Adric finally died after helping Thomas Brewster pilot the TARDIS back to the Doctor and Nyssa in 1868 . ( AUDIO : " The Boy That Time Forgot " ) Undated events . At some point , Adric 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 " ) Personality . Adric was a mathematical genius . He was very proud of his Elite status . He wished to be accepted by his brother Varsh ' s gang , the Outler s , and tried to steal riverfruit to prove himself , but failed . When his brother died , he kept his belt , a symbol of Outler membership . ( TV : " Full Circle " ) Otherwise , the belonging to that rebel party , as well as later attempts to provoke revolutionary riots ( TV : " State of Decay " ) denoted him as a young Turk . He pretended to go along with the plans of the vampires in a ploy to rescue Romana , with whom he got on well . ( TV : " State of Decay " ) Aukon sensed Adric had the strength of spirit to survive becoming a vampire . ( PROSE : " The Eight Doctors " ) Adric was fiercely loyal to the Doctor and had a generally amicable relationship with the Time Lord , who acted as his mentor . Adric wanted desperately to be brave and accepted ; he defied the Master ( TV : " The Keeper of Traken " ) and died trying to solve a math / computer problem , in order to prevent a freighter from crashing into the Earth . As he crashed to his death , unable to access the computer system to input his last mathematical calculation , he held his brother ' s belt and said almost wistfully , " Now I ' ll never know if I was right . " ( TV : " Earthshock " ) Two days after she met Adric , Tegan told Nyssa that he " rubbed [ her ] up the wrong way " and accused him of being condescending and " a male chauvinist . " ( AUDIO : " Psychodrome " ) Adric once described Tegan as being " unreasonably highly strung " . ( AUDIO : " The Toy " ) Other information . Adric watched recordings of " Monty Python " in the TARDIS ' television lounge and often quoted from the series . ( PROSE : " Not So Much a Programme , More a Way of Life " ) Tegan once referred to Adric as " Pyjama Boy " . ( AUDIO : " The Contingency Club " ) Alternative timelines . In an alternate timeline , Adric arrived with the Fourth Doctor and Romana on a planet called Veridis where a man named Tivorg built a machine that brought dead back to life after had successfully resurrected his granddaughter , Asun . The resulting overpopulation and the flood of people that travelled to Tivorg ' s hometown in order to have their loved ones brought back resulted in chaos , which the Doctor knew would only spread to the rest of E - Space , and possibly N - Space , should anyone beyond Veridis find out about it . The Doctor and Romana discovered that the machine had somehow become alive from all the people it had resurrected , preventing it from being shut down . The two Time Lords gave their own lives in order to shut down the machine , leaving Adric alone on Veridis with K9 , with the TARDIS slowing dying following the Doctor ' s own death . After his friends ' deaths , Adric started to make a life for himself on the strange planet , marrying Asun and having two children named Varsh and Neegat . He eventually became a doctor and , after his children grew up , started to travel Veridis with Asun , helping people not only as a doctor , but also in a manner similar to how the Doctor helped people . When Asun died , Adric started a new relationship with a man named Reebac and became close with his grandson . Sometime later he began to have dreams of the Master and his entropy wave destroying all of N - Space , and he knew that this would happen because the Doctor was not around to stop it . After looking into the Doctor ' s and Romana ' s deaths and realising that they could have stopped the machine without giving their lives , Adric used crystals salvaged from the TARDIS to construct a time machine in order to prevent their deaths . He was successful in doing so . It is unknown whether or not this alternate timeline ceased to exist or if he simply disappeared from it , though the fact that his recorded story was heard to be fast - forwarded and rewound by an unknown listener suggests the latter . ( AUDIO : " A Full Life " ) In another alternate timeline , the Doctor was able to save Adric . ( PROSE : " So Vile a Sin " ) Behind the scenes . Matthew Waterhouse has said that the reason he thought the Doctor found Adric annoying was that he noticed some of himself in the boy . Waterhouse theorised that Adric had many qualities of the comparatively young and arrogant First Doctor , whom the Fifth Doctor in particular seemed to want to distance himself from . ( DOC : " The Doctors Revisited - The Fifth Doctor " )