Mobius Doctor Mobius is a think tank operating in the Big MT in 2281 . He is the leader of the robo - scorpion army and nemesis of Dr . Klein and the team he was once a part of . Background . Doctor Mobius was one of the Big MT " Think Tank " executives before the Great War . Sometime after the War , he became a think tank in order to continue his work at Big MT . Like the others , he forgot a part of his personality and his real name , due to the recursion loop in their new perception programming . After the escape of the cazador es and night stalker s , Mobius became disillusioned with the methods of the other think tanks . He grew tired of the endless and horrible experimentation , and was deeply afraid of the damage the amoral and psychosis - ridden think tanks would wreak upon the fragile , post - apocalyptic world in the name of science . He erected a radar fence - a kind of radar - guided repulsive field - around the perimeter of Big MT to prevent the disembodied brains from escaping into the wasteland . After a severe dispute with Klein , Mobius removed all the chips of all personalities of The Sink ; his room and personal laboratory , and against their will , hacked the data banks of his colleagues , reprogramming their chronometers , geometers and cartography programs , making them lose their sense of history , time and the world beyond Big MT to the point that they now believe Big MT is the world and nothing exists beyond its mountainous boundary . He also actively fostered the false notions that robo - scorpion s are somehow able to consume intelligence from brains , fueling the Think Tanks ' fear of leaving Big MT ' s central dome . In the process of making these alterations , though , he also damaged some of their memories and knowledge , leaving only mangled , disjointed versions behind . Disgusted to have done this to his friends , he also erased some sections of his own memory , like this event and his pre - War creation , the robo - scorpion , before exiling himself . Afterward , Mobius moved to the X - 42 robo - warfare facility ( which he renamed the " Forbidden Zone " ) and began to " recreate " the robo - scorpion , inspired by that had wandered into Big MT . These new versions included all features of the pre - War model , such as an energy bolt blaster in the tail , highly sensitive robotic eyes , and communication systems connected directly to his stronghold . Now in possession of a proper army , Mobius decided that without something to distract the other think tank s , the radar fence would eventually become insufficient to contain them . He began to send repetitive , threatening broadcasts , designed to instill fear and prompt the think tanks to focus on retrieving technologies with which to defend themselves . With the remaining think tanks trapped in the central dome by their exaggerated fear of Mobius , the Big MT fell mostly silent . Although not originally aggressive in his intentions , Mobius ' own behavior seems to have degraded over the years , likely in part due to an increasingly serious addiction to and . By 2281 , he had not only lost the functionality of his right " eye " monitor , but also began to suffer from short term memory loss , hallucinations , and obsessive - compulsive behavior . Although his plan had been mostly successful , the recent arrival of Father Elijah , Christine , and Ulysses from the Mojave has caused the curiosity of the think tanks to begin pushing beyond the boundaries he had set for them . The arrival of the Courier , and the subsequent survival of their lobotomy , proved to be the last straw . Mobius unleashed a fresh wave of robo - scorpion s and announced his false intention to finish the other think tanks off once and for all , while subliminally suggesting to them that various technologies around the Big MT would help them against him . These technologies - a sonic emitter , an X - 2 antenna , and a Stealth suit Mk II - are actually all the components required to rehouse a brain inside a body . Eventually , the Courier defeated the X - 42 giant robo - scorpion , entered the Forbidden Dome , and confronted Mobius . Appearances . Mobius appears only in the " " " Old World Blues " .