ET Exclusive: On the Set of 'Iron Man 2'!

Only ET is behind the scenes of 'Iron Man 2' with its invincible stars! Robert Downey Jr. and Gwyneth Paltrow return with new faces of the franchise, including Mickey Rourke, Scarlett Johansson and Don Cheadle — and we have exclusive details of the film’s fiery action and steamy love triangle! "We have been blowing things up, and I have been trying to avoid [Whiplash's] laser whips," Robert tells ET. "Come on, it doesn't get any better than this." In theaters May 7, 2010, 'Iron Man 2' follows the further adventures of billionaire industrialist and weapons manufacturer Tony Stark (Downey Jr.). Now that the world knows his secret identity, he finds himself facing-off against Russian baddie Whiplash (Rourke), devious multi-billionaire businessman Justin Hammer (Sam Rockwell) and the seductive Black Widow (Johansson), who is giving Pepper Potts (Paltrow) a run for her money. But will Tony Stark go it alone? The film is once again helmed by Jon Favreau.