Sealab 2021 is an animated series that airs on Cartoon Network's Adult Swim. Based on Sealab 2020, produced by Hanna-Barbera in 1972, Adam Reed and Matt Thompson cooked up a remix of the Sealab into a funky, hilarious show that revolves around the crew of the underwater laboratory. Four seasons make up this series of clever wit, which technically sacrifices the plot and continuity of Sealab 2021.