In observance of the title’s 300th issue, iconic X-MEN: LEGACY writers Mike Carey, Christos Gage and Simon Spurrier return to tell an all-new tale of the X-Men! Mike Carey brings us a story featuring Professor Xavi—oh wait, he’s dead. Well, Christos Gage has penned a tale involving Rog—nope. She’s dead too. And Simon! There’s Simon Spurrier with a story led by Legion, who—oops.