Cerebro has been stolen—and the trail points directly at the government’s premier think tank, the Baxter Building! The X-Men aren’t happy about it—especially after the shattering events of last month’s Ultimate X-Men issue. And the Baxter Building’s most famous residents—the Fantastic Four—aren’t happy about an angry team of mutants showing up on their doorstep! It’s FF versus X-Men in an all-star blowout that leads directly into next month’s Ultimate Fantastic Four / X-Men! Ultimate Fantastic Four’s Mike Cary is joined by superstar artist Pasqual Ferry for this tour de force of Ultimate action!