A former KGB agent, Natasha Alianovna Romanova, better known as Natasha Romanoff or Black Widow, was trained by the top-secret Soviet brainwashing and training program, the Red Room, to become the ultimate "Super-Spy". She defected from the Soviet Union to the US to join S.H.I.E.L.D. Subsequently, Black Widow proceeded to become a member of the Avengers and has been on the team on numerous occasions. She's a woman with an enigmatic past which very few are acquainted with.