Nuclear testing creates horrific side effects when the Cornish coast is engulfed by dead fish and a local man is found dead from mysterious burns. Marine biologist Steve Karnes (Gene Evans) and Professor James Bickford (Andre Morell) investigate the incidents and soon make an incredible discovery - an even bigger menace lies beneath the waves, and it's heading for the Thames Estuary. A giant mutated paleosaurus emerges onto dry land and embarks on a radioactive rampage that crushes everything in its path. As London stands helpless, Karnes and Bickford devise a dangerous plan to combat the terrifying Behemoth....
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