The Age of Apocalypse brought the X-Men's worst nightmares to life, imagining a world where Charles Xavier's Omega-level mutant son, Legion, traveled back in time and accidentally killed his father before he could form the X-Men. Afterward, Apocalypse took over the world, reshaped it in his image, and only Magneto and his ragtag group of X-Men could stop him.
Source：https://www.cbr.com/x-men-age-of-apocalypse-overused/
