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.
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as Timmy
as MO
as Baby Bug / Mino (voice)
as Spike Frohmeyer
as Sheldon (voice)
as Self
as Charlie Sumner
as Miles
as Little Joe Dirt
as Tucker(1 ep)
as Dewey(151 eps)
as Fuzzy
as Young Arthur(1 ep)