Jump on board here! This is where it all begins! The X-Men face meltdown from within and from without... and their leader, Rogue, faces something worse. Meanwhile a mysterious strike force is taking out the few remaining mutants one by one, with ruthless efficiency. But who is the ultimate target? This special double-sized anniversary issue features a plethora of mutant guest stars, the return of several fan-favorites, and a devastating face-off against the deadliest villain team in the X-Men's forty-four year history! FEATURING THE FIRST ENDANGERED SPECIES BACK-UP STORY LEADING UP TO THIS FALL'S X-MEN EVENT!