Comic-Con: Is Black Widow A Hero Or Villain In 'Iron Man 2'? Scarlett Johansson Isn't Talking!

Iron Man was the talk of the day here at Comic-Con, with today's panel revealing that War Machine will indeed factor into the much-anticipated sequel. Another new addition to the Iron Man universe, Black Widow will make her debut in "Iron Man 2," too.

Here's what actress Scarlett Johansson had to say about her role in the blockbuster sequel and whether she'd be fighting for the good guys or the bad guys.

"You just have to call me a super shape-shifter, I suppose," said Johansson of Black Widow. "You'll have to wait and see. Whose side is she fighting on? I don't know."

Along with promising that her character spends a significant chunk of time "kicking major ass" in the film, Johansson touted her stunt scenes as the must-see moments in her "Iron Man 2" performance. However, she danced around any hints as to exactly whose ass she'll be kicking in the film.