Stryker, a villianous former Army commander, holds the key to Wolverine's  past and the future of the X-Men. This threat re-ignites the call for a mutant registration act. Stryker starts a full-out assault on Professor Xavier's mansion and school. After escaping his plastic cell, Magneto  proposes a partnership with Xavier and the X-Men to combat this new formidable enemy they both have in common.