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