A futuristic underwater sea-lab is having problems with a UFO that's parked between them and a nearby deep ocean trench. As they investigate, they attract the unwanted attention of a dangerous creature who puts the scientists and crew in danger.
Scott Brady
as Commander Wayne
Sheree North
as Dr. Rene Peron
Gary Merrill
as Dr. LaSatier
John Howard
as Dr. James
Wende Wagner
as Sandra Welles
Mike Road
as Hugh Maddox
William Thourlby
as Tex
Biff Elliot
as Dr. Wilson
Roy Barcroft
as Skipper
James Hong
as Ho Lee
Glenn Sipes
as Mike
Richard Niles
as Ellis
