Aaron Carpenter (Earth-616) VS Aaron Stack (Earth-19121)

Dr. Aaron Carpenter was the world's greatest living brain surgeon. He knew Bruce Banner from high school, whom he saw as an "insufferable geek." After Bruce Banner was shot in the head, Carpenter was contacted by the Ancient Order of the Shield,[1] disguised as S.H.I.E.L.D., the ones who secretly had Banner shot, and was brought in to operate on him. During the surgery, Carpenter was ordered to place a device capable of controlling the Hulk's transformations in Banner's brain. Aaron hesitated, and thought of killing Banner to prevent the agency from controlling Hulk, in order to save lives. However, Banner was awakened by the anesthetist, whose life had been saved by the Hulk decades ago, triggering his transformation into the Hulk. The agency released a gas in the operating room in order to eliminate the witnesses of their actions, but the Hulk managed to break a wall and allow the gas to scatter, saving the life of Carpenter and the other participants of the surgery.

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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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