Sealab 2021 was an American animated television series shown on Cartoon Network's adult-oriented programming block, Adult Swim. It premiered on December 21, 2000 and the final episode aired on April 25, 2005. Sealab 2021 is one of the four original Williams Street series that premiered on Adult Swim in 2000 (the others are Aqua Teen Hunger Force, The Brak Show, and Harvey Birdman, Attorney at Law).