Aaron Stack (Earth-19121) VS Aaron Stack (Earth-9200)

Machine Man's history is presumably similar to his Earth-616 counterpart's. When intelligent zombies called the Respawned invaded Earth, a S.H.I.E.L.D./A.I.M. coalition assembled a team of robots called the Ennows to fight the zombies as machines couldn't be zombified. Machine Man was one of the robots. However, after the population of humans fell to almost nothing, the Ennows were left to own devices and and began fighting for themselves against the zombies. When a group of human survivors were attacked by a horde of Respawned, the Ennows, including Machine Man, fought them off. A fight almost broke out between the survivors and the Ennows, but it was quickly broken up. The survivors were then taken into Ennow custody with Machine Man ordering them taken to the holding bays. The Ennows planned to turn the survivors into machines through exposure to the Transmode Virus. However, the process was interrupted by a group of zombies consisting of superhumans with superhuman strength that were able to break through the Ennows' home, the Phalanx Wall. Machine Man was ripped to pieces by the zombies.

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Stack's history is presumably similar to his Earth-616 counterpart's. After nuclear war and biological attacks from the Black Scythe wiped out much of humanity and devastated the world, Stack lived with the descendants of the employees of the White House who survived the onslaught in a hidden bunker beneath the structure.[1] The community didn't have leadership; instead, Stack acted as the community's adjudicator. One day, he and the survivors stumbled upon the Hulk after he followed one of the survivors into a passage that led into the bunker. Stack greeted Hulk but told him that his large size meant that he would greatly lessen the time their supplies lasted. Stack then showed Hulk a city called Dystopia, which was built upon the ruins of New York City by someone called Maestro. Curious about Dystopia, Hulk left the bunker and ventured toward the city. Years later, Hulk became the new Maestro of Dystopia and began conquering neighboring territories. When Stack and his community became the Maestro's next target, Stack evacuated everyone out of the bunker and distracted Maestro with a duplicate of himself while he and the community got away in a plane. The duplicate then detonated a bomb, destroying the bunker and leaving Maestro humiliated.

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