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Dexter's Laboratory (commonly abbreviated as Dexter's Lab) is an American comic science fiction animated television series created by Genndy Tartakovsky for Cartoon Network, and the first of the network's Cartoon Cartoons. The series follows Dexter, a boy-genius and inventor with a secret laboratory in the basement of his house, who constantly battles his sister Dee Dee in an attempt to keep her out of the lab. He also engages in a bitter rivalry with his neighbor and fellow-genius Mandark. The first two seasons contained additional segments: Dial M for Monkey, which focuses on Dexter's pet lab-monkey/superhero, and The Justice Friends, about a trio of superheroes who share an apartment.