Recounts the events leading up to the epic battle between the Avengers and the X-Men, including the depowering of mutants by the Scarlet Witch, the split of the X-Men, and the return of Cable and Hope.

Contains material originally published in magazine form as Avengers: The Children's Crusade #7, X-Men: Schism #5, Magneto: Not A Hero #1, X-Men: Second Coming #1, House of M #8, Avengers: X-Sanction #1 and Point One #1."