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 28 ·
Voice Over
When Dexter's Computer gets Laryngitus, Dexter must find a replacement voice for her.
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Episode 28 of season 4 of Dexter's Laboratory: “Voice Over”. Aired 2003-09-19. Watch it online free on ZapFlix.