Iron Man 2's Robert Downey Jr. offers a few details

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Dec 14, 2012, 3:54 PM EST

Iron Man 2 star Robert Downey Jr. told ETOnline a few tidbits about the upcoming superhero sequel.

"The film is almost entirely about character, and yet we still have twice as much action as we did last time, so it's going to be nuts," Downey told Entertainment Tonight. "Essentially Iron Man 2 is about looking behind the armor, or the armature, of a superhero. It's one thing to say you're Iron Man; it's another thing to be fully ready to do that."

As for co-star Scarlett Johansson, who plays the femme fatale Black Widow, Downey said, "We've been rehearsing, and she's in insane shape. She's getting lean and mean."