The X-Men, mutant heroes sworn to defend a world that hates and fears them, are back! This time, with the help of new recruits The Beast and Angel, they must face evolution itself in the form of their former teammate, Jean Grey. Possessed with the cosmic power of the Dark Phoenix, the resurrected Jean Grey has become a danger to herself, her mutant comrades, and the entire planet. To stave off this imminent threat to humanity, a potential cure is discovered and processed to treat -- and ultimately eliminate -- genetic mutations, once and for all. Now, as the battle lines are drawn, the X-Men, led by Professor Charles Xavier, must contend with both Jean Grey's world-consuming powers, as well as the malevolent Brotherhood, a band of powerful mutants organized under Xavier's former ally, Magneto. In X-Men: The Last Stand, the final chapter in the X-Men motion picture trilogy, a "cure" for mutancy threatens to alter the course of history. For the first time, mutants have a choice: retain their uniqueness, though it isolates and alienates them, or give up their powers and become human. The opposing viewpoints of mutant leaders Charles Xavier (Stewart), who preaches tolerance, and Magneto (McKellen), who believes in the survival of the fittest, are put to the ultimate test -- triggering the war to end all wars. Mutants are on the verge of X-tinction, it seems, when US business Worthington Industries discovers a cure for mutation. This scientific breakthrough complicates and intensifies the battle - both physical and ideological - between Professor X's (Stewart) integration-friendly X-Men and the human-hating muties let by Magneto (McKellen)... When a private laboratory supported by the government finds the cure for the mutants, using the DNA of a powerful boy, the mutants have the option of giving up their powers and become human, but their society split. Magneto (Ian McKellen) opposes and decides to join a force to fight against the government and kill the mutant boy. Meanwhile, Jean Grey (Famke Janssen) resurrects uncontrolled by Xavier and with the personality of the powerful Dark Phoenix. She destroys Cyclops (James Marden) and Professor Charles Xavier (Patrick Stewart), and allies to the evil forces of Magneto, making them almost invincible.