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Dexter's Laboratory (commonly abbreviated as Dexter's Lab) is an American animated television series created by Genndy Tartakovsky for Cartoon Network. It follows Dexter, a boy-genius and inventor with a hidden laboratory in his room, which he keeps secret from his parents. He is in a constant battle with his older sister Dee Dee, who always finds a way to get inside Dexter's lab and inadvertently foil his experiments. Dexter also engages in a bitter rivalry with a fellow boy-genius named Mandark, who is Dexter's neighbor and classmate. Prominently featured in the series' first two seasons are segments featuring superhero-based characters Monkey, Dexter's pet lab-monkey/superhero, and The Justice Friends, a trio of superheroes who share an apartment.