Downey reprises his role as a billionaire genius who fights bad guys in a high-tech metal suit that's loaded with gadgets. "Iron Man 2" reunites Downey with co-star Gwyneth Paltrow and also features Don Cheadle, who replaces Terrence Howard as the superhero's military ally.
Mickey Rourke is signed on to play a villain, and the cast also includes Scarlett Johansson and Samuel L. Jackson, who had a cameo at the end of the first "Iron Man."
Jon Favreau is back directing again for the sequel that hits theaters May 7, 2010.