'Iron Man 2': Scarlett Johansson's hot poster

If you needed one more reason to get excited for "Iron Man 2," here it is.

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That would be Scarlett Johansson as Natasha Romanoff, aka Black Widow, as revealed at this weekend's WonderCon convention in San Francisco.

Johansson's character is introduced as a notary public in Stark Industries' legal department, and she catches the eye of Tony Stark (Robert Downey Jr.) when she delivers him some papers. She's also, however, a S.H.I.E.L.D. agent on a covert mission.

Just what that mission will be is one of the things that director Jon Favreau and the "Iron Man 2" team have thus far managed to keep under wraps. In the Marvel Comics universe, Black Widow is at first Soviet-trained assassin who eventually joins the Avengers; it's not clear yet how closely the movie will follow the comics' continuity.

We do know, however, that Natasha will get to beat down at least one guy. That's in the trailer.

"Iron Man 2" opens on May 7.

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Photo credit: Paramount