Sealab 2020 is an American animated television series produced by Hanna-Barbera Productions and broadcast on NBC from September 9 to December 2, 1972, on Saturday mornings.

A parody follow-up series, entitled Sealab 2021, originally aired on Cartoon Network in December 2000, then on Adult Swim from September 2, 2001 to April 24, 2005.

Commanded by Captain Michael Murphy, Sealab was home to 250 people, and was dedicated to the exploration of the seas and the protection of marine life.

A malfunctioning cargo submarine crashes into the side of the Seamount and its damaged nuclear reactor threatens Sealab, forcing an evacuation.

The oceanauts race against time to prevent the submarine's reactor from melting down, but complicating the situation is its commander, who has an acrimonious history with Captain Murphy.