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 3 ·
Overlabbing
Dexter and Mandark drill underground to expand their labs, but end up overlapping each other's work. They secretly devise a plan to destroy each other.
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Episode 3 of season 4 of Dexter's Laboratory: “Overlabbing”. Aired 2002-11-22. Watch it online free on ZapFlix.