Sealab 2021 is an American adult animated television series. It was shown on Cartoon Network's late-night programming block, Adult Swim. Cartoon Network aired the show's first three episodes in December 2000 before the official inception of the Adult Swim channel on September 2, 2001, with the final episode airing on April 25, 2005. Sealab 2021 is one of the four original Williams Street series that premiered in 2000 before Adult Swim officially launched, the others being Aqua Teen Hunger Force, The Brak Show and Harvey Birdman, Attorney at Law.