Dark Avengers

The Dark Avengers are the main antagonist of the game. They are led by Norman Osborn. After the pulse hit Earth, Osborn was appointed by the World Security Council as Head of S.H.I.E.L.D. He disbanded the Agency and reformed it as H.A.M.M.E.R. He also appointed former villains to be his Avengers by making them dress up like the real Avengers.

Further Reading Marvel Wiki

Non-game canon

 * Gorgon (Second Dark Wolverine)

In-Game Events
A Vengeful Halloween

Bad is Good