They are Mutants - individuals gifted with strange and fantastic abilities by virtue of their genetic makeup. Under a worldwide cloud of increasing anti-mutant sentiment, Professor Charles Xavier created a safe haven where mutants learn to use their unique gifts for the betterment of mankind. Yet even after saving the world from Magneto and his Evil Brotherhood, the X-Men still continue to fight to protect a world that fears them. Their cause becomes even more desperate following an attack by an undetermined assailant who possesses extraordinary abilities. With the fate of Xavier, mankind - and mutantkind - in their hands, the X-Men face their most dangerous mission ever.