Two mutants, Rogue and Wolverine, come to a private academy for their kind whose resident superhero team, the X-Men, must oppose a terrorist organization with similar powers.
When a cure is found to treat mutations, lines are drawn amongst the X-Men—led by Professor Charles Xavier—and the Brotherhood, a band of powerful mutants organised under Xavier's former ally, Magneto.
27 years after overcoming the malevolent supernatural entity Pennywise, the former members of the Losers' Club, who have grown up and moved away from Derry, are brought back together by a devastating phone call.