Hey, Age Of Apocalypse made an appearance, so, why not? * Maybe because Xavier's in a coma for the next 20 years? So even if Onsluaght does pop up somewhere, it'd have to be in the Age Of Apocalypse...and an epic battle would ensue. * Perhaps he'd come to life because of the coma? While Xavier's unconscious, sooner or later, Onslaught will take control, hypothetically.