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 2 · Episode 58 ·
Koos a la Goop a Goop
Koosy tells Dee Dee that he is the king of the land of Koos, but when Dee Dee goes there...
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Episode 58 of season 2 of Dexter's Laboratory: “Koos a la Goop a Goop”. Aired 1997-12-03. Watch it online free on ZapFlix.