Sam Rockwell

Sam Rockwell (born November 5, 1968) is an American actor who voiced Darwin in the 2009 Disney spy-fi comedy film G-Force. He also played Justin Hammer in the 2010 Marvel Studios film Iron Man 2 and Marvel One-Shot: All Hail the King and Zaphod Beeblebrox in the 2005 Touchstone Pictures film The Hitchhiker's Guide to the Galaxy.

Trivia

 * Rockwell was originally offered the role of Tony Stark/Iron Man in Iron Man, but at the end, Robert Downey, Jr. was cast in the role instead. However, Rockwell ended up playing Justin Hammer in its sequel Iron Man 2.