Ultimate X-Men (2001) #92

Hey, on the cover... is that Stryfe and Onslaught? Apocalypse's endgame is revealed as the beleaguered X-Men mount a last-ditch attack to save the world! Meanwhile, two more monstrous threats rear their ugly heads to ensure the young mutants' downfall! It's dark times for the X-Men, courtesy of writer Robert Kirkman and new ongoing penciler Salvador Larroca!