Former delinquent Cornelius Fillmore saw the light, and now fights on the side of justice at X Middle School. Joining him is Ingrid Third, who has a photographic memory. Together, Fillmore and Third fight all those who attempt to break the rules at X, all while keeping Jr. Commissioner Vallejo off their backs and trying to please the school's overly-image-conscious Principal Folsom.

Fillmore! is an American animated television series which was produced by Walt Disney Television Animation. The series was created by Scott M. Gimple and directed by Christian Roman. It was the last series produced by Walt Disney Television Animation alone, without association with Disney Channel.