Meanwhile, the ancient mutant villain Apocalypse had been keeping tabs on this situation and decided to use the opportunity of Xavier's death and the chaos of the mutant community to launch his plans for world domination. Though the nascent X-Men fought valiantly against Apocalypse and his forces, the villain still succeeded, took control, and put into motion a plan that led to the deaths of millions of humans as mutants became the rulers of the planet.
Most of the limited series revolved around mission-specific groups formed by Magneto to continue their guerrilla war against Apocalypse. Along the way, readers got to not only see how these new circumstances changed their favorite characters, but also meet new ones like Blink and X-Man, who became incredibly popular at the time.
Given his already temporally complicated nature, Bishop—who had been present for Legion's accidental killing of Xavier—made his way to the Age of Apocalypse, but knew that this new reality was wrong. Thanks to information he eventually remembered, Magneto's fortitude, X-Man's power, and the combined efforts of the X-Men, Destiny and Illyana Rasputin managed to send Bishop back in time where he stopped Legion from making the biggest mistake in history, thus resetting the time line and all those titles!