X-Men: The New Age of Apocalypse
Scott Lobdell, Larry Hama, Tony Bedard, and Akira Yoshida (Writers); Alvin Lee, Paco Medina, Talent Caldwell, Mark Brooks, and Chris Bachalo (Artists)
Now that Apocalypse has been destroyed and the end of the world has been averted, what could possibly pose a threat to Magneto and his X-Men? Well, perhaps Sinister and whatever massive force he has just unleashed is enough to rile the X-Men and cause them to seek out a since retired Weapon X!
X-Men: Age of Apocalypse One-Shot, X-Men: Age of Apocalypse #1-6