Since the Sacred Timeline was broken after the death of He Who Remains, the Watcher took us to many different universes and assembled the Guardians of the Multiverse to defeat Ultron. Uatu takes us to another universe where all the heroes have mutant abilities, calling themselves the X-Men led by Professor Charles Xavier. The X-Men are transported into the main universe and need to face of the first mutant ever to exist, En Sabah Nur aka Apocalypse who woke up after millions of years.
