The X-Men's past, present and future collide in this 50th anniversary event! Something terrible happens to the past versions of the X-Men that shakes space-time to its core - and more X-Men arrive from the future with a message: the original five must return home! But when young Cyclops and Marvel Girl run away to stay in the present, the hunt is on! Also, where does the modern-day Cyclops' revolutionary faction fit in? Plus, things get even more complicated when mysterious foes attack the Jean Grey School and the healing-impaired Wolverine takes a mortal hit! With space-time up for grabs, the surprise ending will change everything, as the X-Men's footing in the world is drastically altered! Collecting All-New X-Men #16-17, Uncanny X-Men #12-13, Wolverine & the X-Men #36-37, X-Men: Battle of the Atom #1-2 and X-Men #5-6.
— Description from Comic Vine community (comicvine.gamespot.com).
