A group of 21st-century colonists inhabit an underwater city called Pacifica. Originally intended as a purely scientific installation, the U. S. government wants to stash all its gold reserves from Fort Knox there, along with a fantastic new radioactive element. The brother of Pacifica's returning former commander plans to steal the gold and on top of that, the city faces destruction by an asteroid from outer space!

• Warner Bros. Television
• Kent Productions
• Stuart Whitman
• Robert Wagner
• Rosemary Forsyth
• Robert Colbert
• Burr DeBenning
• Susana Miranda
• Paul Stewart
• Whit Bissell