Ev; her husband, Harold; and their lawyer friend, Martin, are skindiving while on vacation in Puerto Rico. When they resurface, they gradually conclude that an unexplained, temporary interruption of oxygen has killed everyone on the island - maybe in the world!
Freezing horror! Hideous atomic mutant strikes from the depths!
An unusual radioactive rock on the sea bottom mutates the ocean life into a horrible monster. When charred, radioactive bodies begin to drift ashore a scientist and government agent investigate the phenomenon, and it's connection to a local marine biology professor.
He keeps human life in test tubes, and prowls at night in the skin of an ape!
Dr. Bernard Adrian is a kindly mad scientist who seeks to cure a young woman's polio. He needs spinal fluid from a human to complete the formula for his experimental serum. Meanwhile, a vicious circus ape has broken out of its cage, and is terrorizing towns people.