What is dexter laboratory mandark?

Mandark is a fictional character from the animated television series Dexter's Laboratory. He is a rival of Dexter and often tries to outdo him in scientific experiments and inventions. Mandark is depicted as very intelligent, but also arrogant, vain, and self-centered. He is known for his long black hair, lab coat, and glasses. Mandark's real name is Susan Astronomonov, and he is voiced by actor Eddie Deezen. Mandark first appeared in season one of the show and has continued to appear in later seasons, as well as in video games and merchandise.