Special Effects meister, Ray Harryhausen's first solo outing. During the testing of an atomic bomb in the Arctic, an enormous dinosaur is freed from the tomb that has encased it for 100 million years. The only witness to the event is Professor Tom Nesbitt (Paul Hubschmid). On returning to New York with the story, no-one believes him, until the beast appears and begins to destroy Manhattan. Can the Professor save the day?