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The X-Men must unite to protect the world from total devastation.
The X-Men are trapped and separated from each other.
The X-Men finish up their battle with Hedgehog just in time to follow Mastermind into Yui's laboratory.
Yui makes a discovery about the anti-mutant gene that's being developed.
The X-Men face off against a gigantic monster with a sinister origin.
The X-Men make a shocking discovery while Wolverine, Storm and Beast defend the Blackbird.
The X-Men investigate the site of the U-Men kidnappings and learn a shocking discovery.
Emma Frost officially joins the X-Men. Meanwhile, Professor X decides to delve into her past.
Professor X worries for the safety of his team when he discovers that certain mutants are gaining secondary powers.
The X-Men struggle to fight against the U-Men when they have inside information on their mutant abilities.
While dealing with a second mutant kidnapping, the X-Men are attacked by a group of anti-mutants.
Professor X calls upon the team to come together to help a struggling mutant in Japan.