Giant-Size Astonishing X-Men #1 comic book from Marvel Comics. Written by JOSS WHEDON, Pencils & Wraparound Cover by JOHN CASSADAY. Too big to be contained in a normal issue, the grand finale of Joss Whedon (Buffy, Firefly) and John Cassaday's (CAPTAIN AMERICA, Planetary) landmark run is right here! The powerlords of Breakworld bring the fight to Earth. Can the X-Men stop them from destroying the whole planet? Will the Avengers join their fight? What we do know is this: one of the X-Men won't walk away from this fight. Plus spotlight interviews with Whedon and Cassaday!