Tartakovsky pitched the series to Fred Seibert's first animated shorts showcase What a Cartoon! at Hanna-Barbera, basing it on student films he produced at the California Institute of the Arts. Prominently featured in the first and second seasons are other segments focusing on superhero-based characters Monkey, Dexter's pet lab-monkey/superhero, and the Justice Friends, a trio of superheroes who share an apartment. Dexter has a bitter rivalry with his neighbor and classmate Mandark, a nefarious boy-genius who attempts to undermine Dexter at every opportunity.

Dexter is at constant odds with his older and more extroverted sister Dee Dee, who always gains access to the lab and inadvertently foils his experiments. The series follows Dexter, an enthusiastic boy-genius with a hidden science laboratory in his room full of inventions, which he keeps secret from his clueless parents, who are only referred to as 'Mom' and 'Dad'. Dexter's Laboratory is an American animated television series created by Genndy Tartakovsky for Cartoon Network and distributed by Warner Bros.

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