The stories that built the Marvel Universe, from the brilliant minds of legendary creators -- now available in an accessible new format the whole family can enjoy! The original X-Men return for a second volume of mutant misadventures -- including the devastating debut of the unstoppable Juggernaut, where you'll learn his shocking connection to Charles Xavier! Plus, thrill to the debuts of the cosmic Stranger, the power-copying Mimic, and -- in a classic three-part saga -- the mutant-hunting robots known as the Sentinels! And for good measure, it's all topped off with the return of Magneto and his Brotherhood of Evil Mutants and the introduction of Lucifer, one of Professor X's earliest foes! They're mutant milestones one and all!