Season 1 of Astonishing X-Men premiered on October 27, 2009.

Cyclops and Emma Frost re-form the X-Men with the express purpose of "astonishing" the world. But when breaking news regarding a cure to the mutant gene unexpectedly hits the airwaves, will it derail their new plans before they even get started? Kitty Pride ( aka shadowcat ) returns to the mansion.

Season 2 of Astonishing X-Men premiered on April 10, 2012.

The tragic death of a student at the Xavier Institute reveals that a powerful enemy is working from inside the mansion to destroy the X-Men; an enemy that knows all of their weaknesses and can predict their every move.

Season 3 of Astonishing X-Men premiered on August 14, 2012.

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! Plus: The X-Man destined to destroy the Breakworld stands revealed! Who is it, and what will be their fate?

Season 4 of Astonishing X-Men premiered on November 13, 2012.

Strap yourselves in, folks! It's Joss Whedon and John Cassaday's final arc on Astonishing X-Men! After the shocking and brain-smashing events of recent issues, the X-Men are off to protect the Earth from its destruction at the hands of the Breakworld. And when it's all over, nothing will ever be the same! No, really, we mean it! Whedon and Cassaday prove they are more than Astonishing: They are unstoppable!