Hanna-Barbera had to change with the times and as the 1970s dawned, kids and adults alike were tuning into the difficulties planet Earth was facing. Ecology and Earth Day were on everyone’s lips. At the same time, parents’ groups were insisting Saturday morning cartoon shows do more than shill cereal and have characters hit one another.
Click here to view the embedded video.
Their answer was Sealab 2020, which lasted a mere season comprising just 13 episodes.