Hawkeye: While he has no super powers, Clint Barton is an expert marksman, and was on the scene when S.H.I.E.L.D. first encountered the Asgardian known as Thor. As a member of the Avenger Initiative, his tranquilizer-tipped arrows are the team's secret weapon against a rampaging Hulk.
Black Widow: An undercover agent of S.H.I.E.L.D., Natasha Romanoff was elevated to non-covert status when she was made a part of the Avenger Initiative. Skilled in all forms of hand-to-hand combat and equipped with several high-tech weapons, she can more than hold her own against any foe.