Joining together the teams from Astonishing X-Men, Age Of Apocalypse and X-Treme X-Men, and spinning out of the pages of Uncanny X-Force comes the X-Event of the year! The evil Nightcrawler from the nightmarish alternate dimension of the Age of Apocalypse just wants to get home, and he'll do whatever it takes to get there. With the fabric of reality at stake, Wolverine calls in a team to confront the doppelganger of their dead friend. But are they ready to do what's necessary?