A "cure" for mutancy threatens to alter the course of history. For the first time, mutants have a choice: retain their uniqueness, although it isolates and alienates them, or give up their powers and become human. The opposing viewpoints of mutant leaders Charles Xavier, who preaches tolerance, and Magneto, who believes in the survival of the fittest, are put to the ultimate test -- triggering the war to end all wars.
Production Twentieth Century-Fox Film Corporation (presents) (as Twentieth Century Fox); Marvel Enterprises (in association with) (as Marvel Entertainment); Donners' Company (producer); Ingenious Film Partners [gb](produced in association with); Dune Entertainment (made in association with); Major Studio Partners (made in association with); X3 Canada Productions [ca]; X3US Productions; XM3 Service; thinkfilm (Washington DC scenes);