X² was released in the year 2003。X² is also called as X2, X2: X-Men U, X-Men 2: X-Men United, X-Mehed 2, X-2, Люди Икс-2, X-Men 2。

Already living in a society that mistrusts them, the mutants are faced with even more discrimination after an unforeseen enemy - who may be a mutant with extraordinary powers - launches a devastating attack. The news of the assault causes a public outcry against the mutants, including renewed support for the Mutant Registration Act, and William Stryker, a military leader rumored to have experimented on mutants (possibly including Wolverine), is among the most vocal supporters of the legislation. Stryker puts into motion a plan to eradicate the mutants and begins an offensive on the X-Men mansion and school. Magneto, having escaped from his plastic prison, forms an unlikely alliance with Professor Xavier to stop Stryker. Meanwhile, Wolverine heads north to investigate his past.

X² actors and actresses include Aaron Stanford, Alan Cumming, Anna Paquin, Bruce Davison, Chiara Zanni, Daniel Cudmore, Famke Janssen, Greg Rikaart, Halle Berry, Hugh Jackman, Ian McKellen, Kea Wong, Kelly Hu, Peter Wingfield, Rebecca Romijn, Roger R. Cross, Shawn Ashmore, Ty Olsson。