Bio
Erik Per Sullivan is an American actor best known for his role as Dewey, the younger brother to middle child Malcolm, on the television series Malcolm in the Middle, from 2000-2006.
He also played the only child in the movie Unfaithful and played an orphaned child in The Cider House Rules.
He was also in the movie Christmas with the Kranks, playing the character of Spike, and played young Joe Dirt in the film of the same name. In the movie Finding Nemo he voiced Sheldon the Seahorse.