A.C. O'Connor (Earth-616) VS Aaron Stack (Earth-19121)

A.C. "Ace" O'Connor was a reporter who got involved in the mysterious robot serial killer story surrounding Rom, Spaceknight. Unknown to the world at large, Rom was actually a heroic figure eliminating evil aliens called Dire Wraiths who had infiltrated the Earth using their shape-changing powers. To human eyes, Rom was killing random people with a ray gun, reducing them to ash. In fact, Rom's Neutralizer was banishing the Dire Wraiths to Limbo. [1] Ace was tipped off at first by the fact that all the "victims" of the robot killer in Clairton, West Virginia all shared the same birthdate. Ace's investigation brought her to the government program Project: Safeguard where she managed to capture Rom's Neutralizer in action on film. Upon developing her photos, she discovered the camera was able to capture what the human eye could not, showing an alien creature disappearing into Limbo instead of the "murder" of a human being.

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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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