In a world altered by the emergence of mutants, the idealistic Charles Xavier founds a secret school to train a new generation: the powerful Jean Grey, the leader Scott Summers, the savage Wolverine, the mystical Nightcrawler, the imposing Storm, the brilliant Beast, and the lethal Psylocke.
Peace is shattered when young mutants disappear at the hands of the Purifiers, an extremist sect led by William Stryker, who plans to use a neurotoxin to eradicate the mutant gene. The threat forces Xavier to forge a truce with Erik Lehnsherr (Magneto), a survivor who despises humanity and believes war is inevitable.
The X-Men must overcome their traumas to assault Stryker's base in the Rockies. Although they manage to prevent genocide, the victory seals an eternal ideological rift: Xavier's dream of integration versus Magneto's supremacy.
POST-CREDITS: In the depths of the Atlantic, sensors detect a seismic anomaly. From the shadows emerges Namor, King of Atlantis, gazing disdainfully at the surface: "The world above has awakened forces it does not understand... and now they will awaken the ocean."
