(W) Joss Whedon (A/CA) John Cassaday. Written by JOSS WHEDON Pencils and Cover by JOHN CASSADAY 50/50 Variant cover by JOHN CASSADAY "UNSTOPPABLE!" Part 1 (of 6) Strap yourselves in* folks! It's the beginning of Joss Whedon and John Cassaday's final arc on Astonishing X-Men! After the shocking and brain-smashing events of last issue* 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 & Cassaday prove they are more than Astonishing: They are UNSTOPPABLE! 32 PGS./Rated T+ ...$2.99