Dewey Wilkerson (Erik Per Sullivan) was the overlooked middle child who became the show's secret weapon - a weird little genius who outsmarted everyone.
Early Season
Started as the "baby" of the family (eating crayons, talking to dead animals), but slowly revealed he was smarter than his brothers combined.
Character Evolution
Grew from the ignored kid to:
1) Piano prodigy
2) Master manipulator
3) Only one who understood Lois
4) Secretly running the household
Best Dewey Moment
1)Faking disabilities for perks
2) His "special" class rebellion
3) The chicken puppet phase
4) Blackmailing Hal with the "Dirty Dancing" tape
While Malcolm was the "genius," Dewey was the true brains of the family. His creepy-cute delivery made him everyone's favorite Wilkerson brother.