The chart-topping super-team of Joss Whedon and John Cassaday concludes their blockbuster run!

Things go from peculiar to just plain bizarre for the X-Men, as Emma Frost's erratic behavior sends the team 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!

COLLECTING: Astonishing X-Men (2004) 13-24, Giant-Size Astonishing X-Men (2008) 1