Bestia Oscura
The X-Men and X-Treme X-Men must vacate the Age of Apocalypse in order to imprison that reality forever. Otherwise, the Exterminators will destroy the whole multiverse. AoA Nightcrawler teleports them to Earth-616 one at a time and Dark Beast goes with them. Dark Beast arrives on Earth-616 but is knocked out by Gambit. After the Age of Apocalypse reality is closed forever with AoA Nightcrawler's sacrifice, Dark Beast is taken away by the authorities.