Black Widow

Biography
Natasha Romanoff was a young Soviet citizen when her government chose to train her in espionage. During her time in the infamous Red Room Academy, she became the master spy known as the Black Widow.

Early in her career, the Black Widow clashed with Iron Man, but her loyalty to her country waned and eventually she switched sides and joined S.H.I.E.L.D. She later joined the Avengers, and has served with distinction on that team many times.