The X-Men's world is about to be turned upside down as Jean Grey's struggles to control the burgeoning powers of the terrifying Phoenix. Plus, the war between man and mutant begins. Magneto, the Mutant Master of Magnetism, returns to wage his war on humanity. However, the United States is no longer as defenceless as they once were. The super-human task force known as The Ultimates is the USA's first line of defence against the mutant threat. But first they must ascertain whose side the X-Men are on. Meanwhile, Magneto's plans for his final assault on humanity continue...