They're back! The chart-topping super-team of Joss Whedon and John Cassaday return for more Astonshing X-Men! If you thought their past efforts were full of shocks and surprises, hold onto your eyeballs - because you haven't seen anything yet, as things go from peculiar to just plain bizarre! Emma Frost's erratic behavior has the X-Men spinning in a non-stop downward spiral. Will an unlikely union be the final straw? After secretly lying in wait for months, the new Hellfire Club makes its move! The X-Man destined to destroy the Breakworld stands revealed! Who is it, and what will be their fate? Collects Astonishing X-Men #13-18.