A new roster! One of the team's most powerful foes! And one of the most popular and requested Avengers returns to the fold! When darkness reigns and chaos falls, there's no room for compromise, no time to run and hide. The world needs EARTH'S MIGHTIEST HEROES! But after the events of Secret Invasion, is Hank Pym ready to rejoin their ranks? And what is the secret that haunts him, a secret dating back to the earliest days of the original team? Join Dan Slott and Khoi Pham for a new age of all-out Avengers action! Collects Mighty Avengers #21-26, and "Requiem" framing sequence.