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Erik Per Sullivan (born July 12, 1991) is an American actor best known for his role as Dewey, the younger brother to middle child Malcolm, on the FOX series, Malcolm in the Middle which was on air for 7 years. Description above from the Wikipedia article Erik Per Sullivan, licensed under CC-BY-SA, full list of contributors on Wikipedia.

Twelve
as Timmy

Mo
as MO

Arthur and the Invisibles
as Baby Bug / Mino (voice)

Christmas with the Kranks
as Spike Frohmeyer

Finding Nemo
as Sheldon (voice)

Searching for the Wendigo
as Self

Unfaithful
as Charlie Sumner

Wendigo
as Miles

Joe Dirt
as Little Joe Dirt

Wonderland
as Tucker

Malcolm in the Middle
as Dewey

The Cider House Rules
as Fuzzy

The King of Queens
as Young Arthur