Following clues to the origin of mankind, a team finds a structure on a distant moon, but they soon realize they are not alone.
After the re-emergence of the world's first mutant, world-destroyer Apocalypse, the X-Men must unite to defeat his extinction level plan.
Jean Grey begins to develop incredible powers that corrupt and turn her into a Dark Phoenix, causing the X-Men to decide if her life is worth more than all of humanity.