Black Widow - The Avengers
Natalia Romanova takes no prisoners. She's a Russian spy turned American superhero, so it's safe to say that she's seen it all. Black Widow was first introduced to the Marvel film franchise in 2010. Finally, after 10 years of being a side character, the femme fatale is getting her own movie. Knowing her, it's going to be more action-packed than all of the Avengers films put together.
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