X2 (often promoted as X2: X-Men United, or internationally as X-Men 2) is a 2003 American superhero film, based on the X-Men superhero team appearing in Marvel Comics, distributed by 20th Century Fox. It is the second installament in the X-Men film series. The film was directed by Bryan Singer, written by Michael Dougherty, Dan Harris, and David Hayter, and features an ensemble cast including Patrick Stewart, Hugh Jackman, Ian McKellen, Halle Berry, Famke Janssen, James Marsden, Rebecca Romijn-Stamos, Brian Cox, Alan Cumming, Bruce Davison and Anna Paquin. The plot, inspired by the graphic novel God Loves, Man Kills, pits the X-Men and their enemies, the Brotherhood, against the genocidal Colonel William Stryker (Brian Cox). He leads an assault on Professor Xavier's school to build his own version of Xavier's mutant-tracking computer Cerebro, in order to destroy every mutant on Earth.