Collects Astonishing X-Men (2004) #13-24 And Giant-Size Astonishing X-Men #1. The chart-topping super-team of Joss Whedon (Marvel Studios? The Avengers, RUNAWAYS) and John Cassaday (Planetary, CAPTAIN AMERICA) return! Things go from peculiar to just plain bizarre as Emma Frost?s erratic?behavior sends the X-Men into a non-stop downward spiral, and the new Hellfire Club makes its move! Plus: the X-Man destined to destroy the Breakworld stands revealed! Who is it? And will the X-Men be able to protect Earth from certain destruction at the hands of the Breakworld? When it?s all over, nothing will ever be the same! No, really, we mean it!