After a mysterious explosion at the Xavier mansion, and the resulting disappearances of Professor Xavier and Jean Grey, the distraught X-Men disband. But soon, Wolverine, Storm, Beast and the others find themselves together again to battle the increasingly powerful Mutant Response Division, and to prevent a catastrophic future that Xavier has warned must never come to pass. With help from their allies, the heroic X-Men wage war against formidable foes as the present and future collide. But who will win? Discover for yourself as this extraordinary series is presented together in one complete collection like never before.