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 1 · Episode 18 ·
The Big Sister
Rerun of the second "What a Cartoon!" pilot.
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Episode 18 of season 1 of Dexter's Laboratory: “The Big Sister”. Aired 1996-06-02. Watch it online free on ZapFlix.