The year is 2020. Somewhere inside the Challenger Sea Mount, atop an underwater mountain, a complex beneath the sea, live 250 men, women and children. Each of them, a scientist and pioneer. Facing our last frontier, a hostile environment which may hold the key to tomorrow, these oceanauts meet new challenges as they build their city beneath the sea. A city known as Sealab 2020. Saturday morning TV took the `70s underwater scifi plunge with these animated adventures. Overseen by Hanna-Barbera's ace action animators and voiced by a superb cast (including John Stephenson, Ross Martin, Jerry Dexter and Ann Jillian), the Sealab oceanauts face seaquakes, sharks and falling satellites while finding the time to serve up lessons on environmentalism, tolerance, and teamwork.