Sealab 2021 An untitled pitch pilot for the series was produced, but wasn't aired on television, but was later released on the Season 1 DVD. Prior to Sealab 2021 becoming a fully developed series (and the creation of the Adult Swim programming block), three different 'pilots' were produced, and aired at various early morning times on Cartoon Network. They are all stand alone episodes, mostly notable because the station is usually destroyed at the end of each one. The destruction of the station becomes a running gag throughout the series.