Hulk

Dr. Bruce Banner was exposed to gamma radiation creating a new being, the Hulk. He was hunted by General Ross and his Hulkbusters. He went into hiding in Canada until he was found by Wolverine. Hulk attacked Wolverine, but their fight was interrupted by the Wendigos. Hulk was knocked unconscious by the Wendigos and turned back into Bruce Banner. When Nick Fury and S.H.I.E.L.D arrived, Wolverine punched Bruce Banner to turn back into Hulk and cause him to attack Nick Fury. He was mentioned twice in "Iron Man is Born", once by Nick Fury and once by Rhodey both of whom called him a monster.