ARC ARC ( Autonomous Reasoning Center ) was the mind of the Entity . Biography . Early life . " to be added " Imprisonment by SERVEYOUinc . For years , ARC was kept on the SERVEYOUinc - operated United System Research Base , where he was studied and tortured by Dr Ballard . ( COMIC : " The Sound of Our Voices " ) It managed to get out and starting reading the minds of the station personnel , which sent them into a coma . Slowly ARC started learning to communicate verbally . ( COMIC : " Whodunnit ? " ) The Eleventh Doctor recognised these attempts and helped ARC switch completely . After that ARC restored all comatose people to their original state . The Doctor helped ARC escape from his captors and took him to travel in the TARDIS with Alice Obiefune and John Jones . ( COMIC : " The Sound of Our Voices " ) Travels with the Doctor . Following a distress call , the TARDIS crew picked up the sole " survivor " from the planet Datastore 8 , a Nimon who in reality was responsible for the planet ' s destruction . Although ARC was not strong enough to overpower the Nimon physically , ARC was instrumental in defeating him because Nimon could not absorb all of ARC ' s energy and exploded in the process . ( COMIC : " Space in Dimension Relative and Time " ) ARC accompanied the Doctor to the " Great Wheel " , the mothership of the Amstron race . He felt the Talent Scout approaching and got scared ( COMIC : " The Infinite Astronaut " ) , which caused him to become prone to violence . This violence saved the Doctor and Jones from Amstron guard s but made it harder for the Doctor to persuade ARC to let them go afterwards . When the Talent Scout arrived disguised as Alice ' s late mother Ada , ( COMIC : " The Eternal Dogfight " ) fear has become so unbearable for ARC that he contracted itself into a ball and remained in this state even after the Talent Scout teleported away . ( COMIC : " The Infinite Astronaut " ) Reunion with the Entity . " to be added " Alternate timeline . In a timeline later averted by the Doctor , ARC volunteered to take the Doctor ' s place to defeat the Nimon who infiltrated the TARDIS , despite potential risks to ARC ' s life . In this version of events , ARC assumed the Doctor ' s appearance , caused the Nimon to explode as in the final timeline and succeeded in getting rid of a black hole bomb created by the Nimon . ( COMIC : " Space in Dimension Relative and Time " ) Biology and abilities . ARC ' s body did not have cell s . The Eleventh Doctor described it as a big glob of stuff . ( COMIC : " The Infinite Astronaut " ) ARC ' s extremities could significantly elongate . ( COMIC : " The Sound of Our Voices " ) ARC could also assume the appearance of another person but could not completely copy the way they speak . ( COMIC : " Space in Dimension Relative and Time " ) In addition , ARC could grow in size and semi - absorb other beings within his body rendering them immobile . ( COMIC : " The Eternal Dogfight " ) By touching a person , ARC could transfer all information from their brain , leaving a perfectly healthy but comatose body behind . This process could be reversed . ( COMIC : " The Sound of Our Voices " ) ARC ' s internal energy was so vast that even a Nimon could not handle it and would explode in an attempt to absorb all this energy . ( COMIC : " Space in Dimension Relative and Time " ) Once ARC ate a chaise longue . ( COMIC : " The Eternal Dogfight " ) ARC could feel when the Talent Scout was approaching . ( COMIC : " The Eternal Dogfight " ) Behind the scenes . ARC is both a playable character and an enemy in the " Doctor Who : Legacy " mobile game .