Natasha Romanoff, otherwise known as the Black Widow, is a recurring character in the Marvel Cinematic Universe films. She appeared in Iron Man 2, The Avengers, and will appear in Captain America: The Winter Soldier and The Avengers: Age of Ultron. Scarlett Johansson plays her. She is a beautiful but mysterious woman with gymnastic skills and martial arts and is a S.H.I.E.L.D. agent.