Dexter's Laboratory : Babysitter Blues (1996)
Directed by Craig McCracken
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Synopsis by Emru Townsend
Lisa the babysitter is coming over to take care of Dexter and Dee Dee while their parents go out for the evening. Although he's dressed to the hilt and prepared everything to be just right, he discovers to his dismay that Lisa already has a boyfriend, Jeff. Dexter schemes to use science to eliminate his unseen rival and make himself the perfect replacement. (Original air date: November 27, 1996.)