X-51 [Aaron Stack; Machine Man]; The Brotherhood of Evil Mutants [Mystique; Blob; Mimic; Toad; Post]; Sebastian Shaw; Henry Peter Gyrich; CAMEO FLASHBACK: Colossus; Kitty Pryde; Nightcrawler; Nick Fury; Bastion; Warlock; Red Skull; Cable; Sentinel; Thor; Captain America [Steve Rogers]; Iron Man [Tony Stark]; Deathlok; Master Mold
Machine Man takes down the Brotherhood of Evil Mutants. As he does, he discovers he can detect mutants and instantly analyze their abilities and exploit their weaknesses. When he is damaged during the battle, he senses nanotechnology at work inside of him, rebuilding him instantly. After defeating the Brotherhood, X-51 flies away to discover more about his new abilities and to rediscover the man in him, Aaron Stack. It is also revealed that Mystique and the Brotherhood were hired by Sebastian Shaw to go after Machine Man, for reasons known only to himself.