3.14159 (Earth-1191) VS Aaron Stack (Earth-TRN813)

The Sentinel that would name itself 3.14159 was one of the Sentinels brought to Earth-616 by the time traveler Trevor Fitzroy of Earth-1191. As part of the "game" he was playing with the Upstarts, Fitzroy sent his Sentinels to murder the Reavers, and their leader Donald Pierce.[1] This Sentinel was severely damaged and shut down, and constantly doused in the bio-mechanical fluid that Pierce had used to create his cyborgs and androids. Later when Wolverine and Jubilee went to the Reavers headquarters to investigate on orders from Professor X they accidentally reactivated the Sentinel.[2] Having become sentient due to its exposure to the bio-mechanical fluid, it determined that it should act in the best interest of Sentinel kind and decided to wipe out all of humanity. Using a time warp to transport itself (along with Wolverine and Jubilee) to the Anthill, the base of the now deactivated Sentinels built by Larry Trask, it built a device that would cause a solar flare and eradicate all human life on the Earth.

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When Iron Man and his allies, including Machine Man, followed Arno Stark to the Stark Space Station to stop his plan to mentally control all of humanity, the Extinction Entity arrived. Now convinced that Arno was right, Tony and his allies were rallied by him to fight the attacking monster. They were joined by Earth's heroes, and the Extinction Entity was ultimately defeated when Arno willingly assimilated with it, causing it to explode due to his paradoxical nature as a human who was more of an A.I. at heart. Arno survived, and was hailed as a hero. The scenario that took place in this reality manifested on Earth-616 in the form of a virtual dream within the eScape that Arno Stark was submerged into by Tony Stark when he encased Arno in his Virtual Armor in order to stop his plan to take control of humankind to combat the non-existent Extinction Entity which was a delusion caused by his relapsing illness.

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