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 69 ·
Let's Save the World You Jerk!
Dexter and Mandark must team up in order to save the Earth from a meteor rain.
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Episode 69 of season 2 of Dexter's Laboratory: “Let's Save the World You Jerk!”. Aired 1998-02-04. Watch it online free on ZapFlix.