The ultimate X-Men ensemble fights a war for the survival of the species across two time periods as they join forces with their younger selves in an epic battle that must change the past – to save our future.

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.

After the re-emergence of the world's first mutant, world-destroyer Apocalypse, the X-Men must unite to defeat his extinction level plan.

Professor Charles Xavier and his team of genetically gifted superheroes face a rising tide of anti-mutant sentiment led by Col. William Stryker. Storm, Wolverine and Jean Grey must join their usual nemeses—Magneto and Mystique—to unhinge Stryker's scheme to exterminate all mutants.

Wolverine faces his ultimate nemesis - and tests of his physical, emotional, and mortal limits - in a life-changing voyage to modern-day Japan.

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.

The X-Men face their most formidable and powerful foe when one of their own, Jean Grey, starts to spiral out of control. During a rescue mission in outer space, Jean is nearly killed when she's hit by a mysterious cosmic force. Once she returns home, this force not only makes her infinitely more powerful, but far more unstable. The X-Men must now band together to save her soul and battle aliens that want to use Grey's new abilities to rule the galaxy.

Season 2 depicts the different approaches to the fight for mutant civil rights that are taken by the Mutant Underground and the Hellfire Club, and also introduces the Morlocks and further explores the Purifiers—all groups originating in the comics.

A suburban couple's ordinary lives are rocked by the sudden discovery that their children possess mutant powers. Forced to go on the run from a hostile government, the family joins up with an underground network of mutants and must fight to survive.