In the distant future of 1968 (!) many ships and planes are crossing the North pole to transport passengers and cargo. But lately, several ships and submarines have vanished mysteriously near the Arctic Circle.
The nuclear-powered US submarine Tigershark is sent out to investigate.
Captain Wendover (Dick Foran) and his fearless crew find themselves besieged by electrical storms, an Unidentified Floating Saucer, and lots of hairy tentacles.
Commander Richard “Reef” Holloway
Captain Dan Wendover
Dr Carl Neilsen
Lieutenant David Milburn
CPO “Griff” Griffin
Dr Clifford Kent
Spencer G. Bennet