The radiation from French nuclear testing in Polynesia causes a change in plant and animal life. Dr. Niko Tatopoulos is called to duty from a project in Chernobyl, where he examined worm growth, to a site in Tahiti, where traces of an oversized lizard were found. Meanwhile, Godzilla is heading for Manhattan, where it arrives on a rainy day. Soon, the city is sealed by the military. With the help of the the worm guy and other scientists, they try to get ride of the threat. But when Dr. Tatopoulos suggests the possiblity of Godzilla being pregnant and capable of placing several eggs somewhere in the city, his theory is not accepted. In addition, he gets fired from the team later on. Being alone with his theory, Philippe Roche, a French insurance representative, addresses him in order to help him to prove his theory."