Before Charles Xavier and Erik Lensherr took the names Professor X and Magneto, they were two young men discovering their superhuman powers for the first time, working together in a desperate attempt to stop the Hellfire Club and a global nuclear war.

When Professor Xavier and Jean Grey disappear and the mansion explodes, the X-men are left scattered. However with the rise of powerful enemies and a foreboding prophesy, they join together to battle for the future.