What is to become of (CENSORED) and the mutants who side with him after the big split? And what does it have to do with the resurrected Mister Sinister? The hottest new writer in the business, Kieron Gillen (Thor) and superstar Carlos Pacheco (X-Men:Schism, Ultimate Avengers) bring you the biggest and baddest X-Men you've ever seen. COLLECTING: UNCANNY X-MEN 1-4