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 opposes and decides to join a force to fight against the government and kill the mutant boy. Meanwhile, Jean Grey resurrects uncontrolled by Xavier and with the personality of the powerful Dark Phoenix. She destroys Cyclops and Professor Charles Xavier, and allies to the evil forces of Magneto, making them almost invincible.