Avengers

Labeled Earth's Mightiest Heroes, the Avengers originally consisted of Hank Pym, Hulk, Iron Man, Thor and the Wasp. The original Captain America was discovered, trapped in ice, and joined the group after they revived him. A rotating roster became a hallmark, although one theme remained consistent: the Avengers fight "the foes no single superhero can withstand." The team, famous for its battle cry of "Avengers Assemble!", has featured humans, mutants, robots, aliens, supernatural beings, and even former villains.

After a worldwide event that caused a blackout, the World Security Council disbanded S.H.I.E.L.D. and gave the reign to Norman Osborn and his Organization H.A.M.M.E.R.. The leader of S.H.I.E.L.D., Col. Nick Fury, calls on the Avengers to investigate and stop whatever schemes Norman Osborn, H.A.M.M.E.R and the Dark Avengers are hatching.

Further Reading Marvel Wiki

Special Events
Avengers Weekend

Avengers Elite (Elite Training)

Earth's Mightiest