Sealab 2020
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 . 
<triplet> Sealab 2020 <subj> Hanna-Barbera Productions <obj> production company <subj> December 2, 1972 <obj> end time