X2 (often promoted as X2: X-Men United, or internationally as X-Men 2) is a 2003 American superhero film, based on the fictional characters the X-Men. Directed by Bryan Singer, it is the second film in the X-Men film series. It stars an ensemble cast including Patrick Stewart, Hugh Jackman, Ian McKellen, Alan Cumming, Famke Janssen, Anna Paquin, Shawn Ashmore, Aaron Stanford, Brian Cox, Rebecca Romijn-Stamos, James Marsden, Halle Berry and Kelly Hu. 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.