Dexter's Laboratory | Detention | Cartoon Network

Dexter is given detention after accidentally shouting out the answer to a test question to his classmate. When he and the other students try to escape from the detention room run by a fierce retired warden, they end up in a state prison.

Past the vaulted doors lives the smartest boy the world has ever seen, Dexter, boy genius! He's constantly creating dazzling, world-saving inventions in his secret laboratory. His big sister Dee Dee frequently wrecks his experiments. However, he has bigger problems such as his nemesis, Mandark, his brilliant rival at Huber Elementary School. Mom and Dad, of course, have no idea what their little angel is up to.