The 25-year-old actress - who plays sexy Russian spy Black Widow in the superhero movie - admitted she actively campaigned for the role after actress Emily Blunt dropped out because of scheduling conflicts.
She said: "I was a huge fan of the first movie and was quite 'geek-ed' out at being part of the second one. I just wanted to be a part of Iron Man so I really researched the comic books and came in with some ideas of my own about how to develop the character. I see her as being determined and ambitious."
Scarlett was anxious to get the part because she was keen to "kick ass" alongside her co-stars Gwyneth Paltrow, Samuel L. Jackson and Robert Downey Jr.
She said: "I love everything about this character. She's a total badass. I love every detail from her fabulous outfit to the wonderful hair. I mean, there's nothing not to like about the character. She's very bad and I think it's rare that we get to see these sort of super heroines bought to the screen, where they're really kicking some major ass, which she does."
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