8 Beloved Child Actors Who Completely Disappeared From Our Screens

6. Erik Per Sullivan

Another Malcolm In The Middle alumnus, the adorable Erik Per Sullivan starred as Muniz's younger, equally hyper-intelligent brother on the show. Despite being bullied by his older siblings, Sullivan's Dewey had it better off than Malcolm by virtue of the fact that he was musically gifted and wasn't wracked with the kind of crippling self-doubt his brother faced on a daily basis.

Unfortunately, he wasn't luckier than Muniz in real life, as though Sullivan garnered a few awards from his time on Malcolm and took on a few minor film roles in such memorable works as Christmas With The Cranks, after the series ended the work seemed to dry up. This didn't seem to faze the actor, who seemed happy to have the free time to finish school and attend university from 2009.