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 6 ·
Momdark
Mandark disguises as Mom in order to get into Dexter's Lab.
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Episode 6 of season 3 of Dexter's Laboratory: “Momdark”. Aired 2001-11-16. Watch it online free on ZapFlix.