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Fictional superheroine appearing in American comic books published by Marvel Comics. Created by editor and plotter Stan Lee, screenwriter Don Rico, and artist Don Heck, the character debuted in Tales of Suspense #52 (April 1964). The character was introduced as a Russian spy, an antagonist to the superhero Iron Man. She later defected to the United States, becoming an agent of the fictional organization S.H.I.E.L.D., and a member of the superhero team The Avengers.