The past, present and future of the X-Men collide in this 50th Anniversary event crossover! When investigating a new mutant, something truly horrible happens to the All-New X-Men that shakes time and space to its core. This is so dire that X-Men come from the future with a message: the All-New X-Men must return to the past!

BATTLE OF THE ATOM PART 4 The Uncanny X-Men enter the crossover. Whose side will they be on?

The X-Men's past, present and future collide in an uncanny event 50 years in the making! In a desperate bid to save Xavier's dream, the Beast brought the original X-Men forward to the present. Now, with the timeline - and all of existence - in jeopardy from their presence, they must go back. But faced with the horror of what fate would have in store for them, young Cyclops and Marvel Girl are intent on staying and forging their own destiny. And as debate rages and tempers flare, the X-Men of the future arrive with a dire warning, seeking to prevent history's greatest mistake! Celebrate the X-Men's 50th anniversary with a time-twisting epic for the ages! 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, X-MEN 5-6