"Who Dares Defy the Demi-Men?"
Warren returns to the mansion to find out Cerebro is still tracking mutants, and a lot of them. Mesmero, disciple of Magneto is trying to rally all mutants to take over the world as the X-Men oppose them. After the first battle, they discover a latent mutant, Lorna Dane.
X-Men reform as a team. First appearance of Mesmero, his Demi-Men minions and Lorna Dane, aka Polaris. Back-up story continues the Origin of the X-Men series, featuring Beast.