Sealab 2021 - AbsoluteAstronomy.com

Sealab 2021 is an American animated television series. It was shown on Cartoon Network

Cartoon Network

Cartoon Network is a name of television channels worldwide created by Turner Broadcasting which used to primarily show animated programming. The channel began broadcasting on October 1, 1992 in the United States....

's adult-oriented programming block, Adult Swim

Adult Swim

Adult Swim is an adult-oriented Cable network that shares channel space with Cartoon Network from 9:00 pm until 6:00 am ET/PT in the United States, and broadcasts in countries such as Australia and New Zealand...

. It premiered on November 23, 2000 and the final episode aired on April 25, 2005. Sealab 2021 is one of the four original Williams Street

Williams Street

Williams Street Productions, LLC, operating under the name Williams Street, is a division of Cartoon Network, which is owned by Turner Broadcasting, an operational unit of Time Warner...

series that premiered in 2000 before Adult Swim officially launched, the others being Aqua Teen Hunger Force
Aqua Teen Hunger Force
Aqua Teen Hunger Force , retitled Aqua Unit Patrol Squad 1 in 2011, is an American animated television series on Cartoon Network late night programing block, Adult Swim, as well as Teletoon's Teletoon at Night block and later G4 Canada's ADd block in Canada...

, The Brak Show
The Brak Show
The Brak Show is an animated television series that aired on Cartoon Network's late night programming block, Adult Swim. The Brak Show is a spin-off of the animated television series, Space Ghost Coast to Coast, and featured recurring characters from Space Ghost Coast to Coast and Cartoon Planet...

, and Harvey Birdman, Attorney at Law
Harvey Birdman, Attorney at Law
Harvey Birdman, Attorney at Law is an American animated television series comedy created by Williams Street and produced by Cartoon Network Studios that aired on Cartoon Network during its Adult Swim late night programming block. The series' pilot first aired in 2000, and later became a series in...

.

Much like Adult Swim's Space Ghost Coast to Coast
Space Ghost Coast to Coast
Space Ghost Coast to Coast is an American animated parody talk show hosted by the 60s Hanna-Barbera cartoon character Space Ghost. The show premiered on April 15, 1994 on Cartoon Network...

, the animation used stock footage from a 1970s Hanna-Barbera

Hanna-Barbera

Hanna-Barbera Productions, Inc. was an American animation studio that dominated North American television animation during the second half of the 20th century...

cartoon

Cartoon

A cartoon is a form of two-dimensional illustrated visual art. While the specific definition has changed over time, modern usage refers to a typically non-realistic or semi-realistic drawing or painting intended for satire, caricature, or humor, or to the artistic style of such works...

, in this case the short-lived, environmentally

Natural environment

The natural environment encompasses all living and non-living things occurring naturally on Earth or some region thereof. It is an environment that encompasses the interaction of all living species....

themed Sealab 2020
Sealab 2020
Sealab 2020 is an American animated television series produced by Hanna-Barbera. The series is about the crew of an underwater research base and has an environmental theme. The series premiered on the television network NBC on September 9, 1972...

, along with original animation.