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 4 ·
Sis-Tem Error
Dee Dee accidentally breaks down Dexter's lab, and she tries to not and let him know its broken.
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Episode 4 of season 4 of Dexter's Laboratory: “Sis-Tem Error”. Aired 2003-04-25. Watch it online free on ZapFlix.