Dexter's Laboratory is an American comic science fiction animated children's television series created by Genndy Tartakovsky for Cartoon Network. The series follows Dexter, a boy-genius with a secret laboratory filled with his inventions. He 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. The series' first two seasons contain additional segments: Dial M for Monkey, which focuses on Dexter's pet lab-monkey-turned-superhero, and The Justice Friends, about a trio of superheroes who share an apartment. Tartakovsky first pitched the series to Hanna-Barbera's animated shorts showcase World Premiere Toons, basing it on student films he produced while attending the California Institute of the Arts. A pilot aired on Cartoon Network in February 1995, and in August viewer approval ratings convinced the network to order a half-hour series, which premiered on April 27, 1996. By 1999, 52 episodes and a television movie had been produced, and Tartakovsky then left the series to begin work on his other projects, Samurai Jack and Star Wars: Clone Wars. In 2001, the network revived the series under a different production team at Cartoon Network Studios, and after 26 more episodes, the series ended on November 20, 2003.