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 78 ·
My Favorite Martian
Dexter goes to Mars to find alien life forms.
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Episode 78 of season 2 of Dexter's Laboratory: “My Favorite Martian”. Aired 1998-02-25. Watch it online free on ZapFlix.