When we say "Black Widow" in the Marvel universe, up til now, we've pretty much always been referring to Natasha, the Soviet assassin turned SHIELD superspy and original Avenger. After being spared by a young Clint Barton, Nat joins SHIELD and becomes one of the best agents in the world before becoming one of the six original Avengers and one of the team's strategic leaders. She was the first female superhero shown on-screen in the Marvel movies, first appearing in Iron Man 2, and she's finally getting her own movie, nearly 10 years to the date after her film debut.