Join two comic legends as they deliver an explosive confrontation between the X-MEN and the SHI'AR! Chris Claremont and Mike Grell pit the mighty Imperial Guard against Xavier's X-Men in an all-out battle! As the fighting rages on, questions mount-why have the Imperial Guard attacked? And what do they want from Xavier? Don't miss this explosive issue that will turn the X-MEN FOREVER UNIVERSE UPSIDE-DOWN! Plus, a reprint of X-Men #108!