The series revolves around a boy genius named Dexter, who has a secret laboratory filled with highly advanced equipment hidden behind a bookshelf in his bedroom. Access to this never-ending laboratory is achieved by speaking various passwords or by activating hidden switches on the bookcase. Dexter is normally in conflict with his ditzy older sister, Dee Dee, who has an uncanny talent for gaining access to Dexter’s lab despite his best efforts to keep her out. Dee Dee eludes all manner of security and, once inside, delights in playing in the lab, often destroying his inventions and creations. For reasons left unexplained, Dexter manages to keep the lab a secret from his clueless, cheerful parents, and in the beginning of the show, Dee Dee is the only other character to know about his lab. In several episodes, however, he is forced to reveal his lab to his parents, although such episodes always end with his parent’s memories being wiped. His name forms the root of the word dexterous, meaning one who is mentally adroit and skillful with the hands.