Warren Worthington, aka Angel, loses the fight with the Archangel persona, one of Apocalypse's Four Horsemen, that invaded him on the death of Apocalypse, and his team members are forced to imprison their friend. They travel to another dimension, the Age of Apocalypse, looking for a way to save Warren, but they must face twisted versions of their loved ones there, as well as learning a secret of the Age of Apocalypse that makes their mission to defeat Archangel even more important.