Enslavement. Torture. Annihilation. Apocalypse looked into the future of mutantkind and, foreseeing disaster, enacted an end-game to save the children of the atom from the hatred of their less-gifted but more numerous brethren. But his plan to create a burgeoning mutant population has backfired disastrously. When a Celestial arrives to stand judgment on humanity, will X-Factor and their sworn enemy be forced to work together to assure humanity's salvation?