X-Men #56 Newsstand

"The beginning of the end: Twilight of the gods." Joseph tells Captain America the story of Dr. Doom’s arrival in New York.He asks why Doom is helping out, and Captain America responds that he’s making sure the Earth exists so that he can rule it one day.Meanwhile, Onslaught tries to absorb X-Man’s powers, but he manages to resist.Onslaught reads his mind, and is angered when he learns that the mutants who ruled X-Man’s world also destroyed it.He then absorbs X-Man into his body, forcing him inside with Franklin Richards.Xavier secretly leaves the rest of the heroes to personally confront Onslaught.Onslaught destroys his wheelchair, and tells him that neither humans nor mutants are fit to rule, so everyone must be destroyed.