(W) Christos N. Gage, Dan Slott (A) Paco Diaz Luque & Various (CA) Khoi Pham. Written by DAN SLOTT & CHRISTOS GAGE Penciled by KHOI PHAM* RAFA SANDOVAL* STEPHEN SEGOVIA* SEAN CHEN & NEIL EDWARD Covers by KHOI PHAM When darkness reigns* founding Avenger Hank Pym decides the world once again needs Earth's Mightiest Heroes! Quicksilver* USAgent* Vision* Stature* Jocasta* Hercules and Amadeus Cho answer Pym's call but with an oddly sinister Scarlet Witch alerting the squad to new missions* and Pym's fixation on his deceased ex-wife drawing concern from his new teammates* can this fledgling group of Avengers overcome threats such as the chaotic Chthon* Norman Osborn's Cabal and the deposed Inhuman monarch known only as the Unspoken? Plus: The Mighty Avengers find themselves embroiled in a grudge match against the Fantastic Four and a savage showdown with the Dark Avengers* and Pym is named the universe's Scientist Supreme! But when Loki's schemes come to fruition* and the Mighty Avengers must contend with the Siege of Asgard* can the team survive without its leader and can Pym survive a confrontation with his sinister cybernetic "son*" Ultron? Collecting MIGHTY AVENGERS #21-36 and material from SECRET INVASION: REQUIEM 424 PGS./Rated T+