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 4 · Episode 8 ·
Monstrosi-Dee Dee
A Monster starts roaming Dexter's lab, although Dexter doesnt know its just Dee Dee, who ate an apple in a failed lab experiment.
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Episode 8 of season 4 of Dexter's Laboratory: “Monstrosi-Dee Dee”. Aired 2003-05-02. Watch it online free on ZapFlix.