Erik Per Sullivan (Dewey) makes his TV network debut as the youngest son, Dewey, on Malcolm in the Middle. Fluent in both English and Swedish, Sullivan has appeared in the feature film Armageddon and can be seen as "Fuzzy" in the Miramax release The Cider House Rules.

Sullivan, who is in the top of his class and holds a first-degree black belt in tae kwon do, resides with his family in Milford, Mass.