IT'S THE AVENGERS VERSUS THE X-MEN - with the Young Avengers and X-Factor caught in the crossfire -- as all four teams battle to determine who will hold the Scarlet Witch responsible for her crimes. Plus, when the origin of the Scarlet Witch's godlike powers - and the secret history of her murderous rampage in "Avengers: Disassembled" -- are finally revealed, the truth creates a rift among the members of the Young Avengers that the team may not survive.