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A geology expedition in the Amazon uncovers fossilized evidence (a skeletal hand with webbed fingers) from the Devonian period that provides a direct link between land…

A nuclear submarine on maneuvers in the Pacific Ocean, captained by Commander Pete Mathews (Kenneth Tobey), comes into contact with a massive sonar return. The commander…

The film has a two-act structure, the first act taking place in the exotic locale of the Himalayas and the second occurring in Los Angeles, California. While the first…

Dr. Donald Blake (Arthur Franz), a science professor at Dunsford University, receives delivery of a coelacanth. A student, Jimmy (Troy Donahue), asks Blake if the fish…

In Montreal, Quebec, Canada, scientist André Delambre (Al Hedison) is found dead with his head and arm crushed in a hydraulic press. Although his wife Hélène (Patricia…