Dexter's Laboratory

Dexter's Laboratory 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 constantly at odds with his older sister Dee Dee, who always finds a way to enter Dexter's lab and inadvertently foils his experiments. Dexter has a bitter rivalry with a fellow boy-genius named Mandark, who is his neighbor and classmate. Segments featuring superhero-based characters Monkey, Dexter's pet lab-monkey/superhero, and the Justice Friends, a trio of superheroes who share an apartment, are prominently featured in the first two seasons.