Wealthy inventor Tony Stark (Robert Downey Jr.) -- aka Iron Man -- resists calls by the American government to hand over his technology. Meanwhile, Ivan Vanko (Mickey Rourke) has constructed his own miniaturized arc reactor, causing all kinds of problems for our superhero. Sam Rockwell, Gwyneth Paltrow, Scarlett Johansson, Don Cheadle and Samuel L. Jackson co-star in director Jon Favreau's sequel based on Marvel comic book characters.