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 8 ·
A Failed Lab Experiment
Dexter creates a device taht doesn't work the way he wanted.
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Episode 8 of season 3 of Dexter's Laboratory: “A Failed Lab Experiment”. Aired 2001-11-30. Watch it online free on ZapFlix.