Ultimate Astonishing X-Men #1

Apocalypse rules the world and Magneto and his X-Men are the last bastion of hope for a rapidly dying humanity. To complicate things, the stranger, Bishop, has arrived and told Magneto that this reality is false and solely due to the untimely death of Charles Xavier in the past. As the X-Men discuss this conundrum, Blink and Sunfire arrive at X-Mansion and tell their teammates that Apocalypse has once again begun culling human beings through his agent, Holocaust. The X-Men prepare to face Holocaust and bid their farewells, realizing that this mission is most likely of the suicide variety.