Black Widow

Natasha Romanoff is a Marvel Comics character and a major character in the Marvel Cinematic Universe. She is a former agent of S.H.I.E.L.D. codenamed Black Widow and a member of the Avengers.

Early Life
Romanoff was born in 1984 at Stalingrad. She was recruited by the KGB and trained in espionage, which she excelled at greatly, and was sterilized as a final ceremony. Her expertise caused her to be on S.H.I.E.L.D.'s radar, and was hunted by Clint Barton, who instead recruited her on S.H.I.E.L.D..

At some point in 2009, Romanoff was assigned to protect a nuclear scientist who was targeted by the Winter Soldier. Though she managed to save the scientist from falling off the cliff, the Winter Soldier murdered the scientist anyway.

In 2010, Romanoff was assigned to infiltrate Stark Industries. Under the alias of "Natalie Rushman," Romanoff arrived as Pepper Potts's replacement, and helped Tony Stark deal with his palladium poisoning. She assisted Stark in battling Ivan Vanko during the Stark Expo.

How The Avengers Should Have Ended
Black Widow participates in the Battle of New York, and joins the Avengers in having shawarma. In a post-credits scene, she reassures Barton that his face, which is bruised, is okay.