The nationwide release of what is expected to be another blockbuster film "Iron Man 2" is this Friday. The sequel to 2008's "Iron Man" stars Robert Downey, Jr. as industrialist-turned-superhero Tony Stark. "Iron Man 2" also introduces Stark to a new adversary played by Mickey Rourke. Gwyneth Paltrow returns as Stark's love interest Pepper Potts. "Iron Man 2" is rated PG-13. Here's the trailer...