He was a well-respected agent of S.H.I.E.L.D., often working alongside the Black Widow on missions.
Shortly before the events of the supervillain breakout that led to the formation of the Avengers, Black Widow betrayed him and branded him a double-agent working with Hydra. S.H.I.E.L.D. proceeded to lock Barton up in one of the four major supervillain prisons. During the breakout however, he escaped; and also had a brief confrontation with Iron Man, who at the time thought that he was just another villain.
Eventually Barton's name was cleared and he was offered an opportunity to be reinlisted as a S.H.I.E.L.D. agent. Barton however refused, saying that he didn't want to be part of the same organization that locked him up. It wasn't long afterwards that he became a member of the Avengers; fighting alongside several of Earth's mightiest heroes to put a stop to threats such as Kang's invasion of Earth and the Leader's attempt to turn everyone into gamma-irradiated monsters.
He is vocied by Chris Cox.