Dexter's Laboratory
Dexter, a boy-genius with a secret laboratory, constantly battles his sister Dee Dee, who always gains access despite his best efforts to keep her out, as well as his arch-rival and neighbor, Mandark.

Season 3 · Episode 22 ·
A Silent Cartoon
Dexter is trying to build his lab blue, but Dee Dee keeps making it pink.
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Episode 22 of season 3 of Dexter's Laboratory: “A Silent Cartoon”. Aired 2002-06-14. Watch it online free on ZapFlix.