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!

Endangered Species, Chapter 1

Beast is very troubled by the events of House of M. Beast has done many experiments by himself and with the help of some of the best minds but only finds a dead-end. So, Beast is selling his soul to nine super villains for help in finding a cure to restore the dying mutant population.