During the 1970s, when all areas of Japan has been polluted, a microscopic alien life form feeds on the Japanese coastal pollution, in order to grow into the poisonous sea monster ‘Hedorah’, that then raid all parts of Japan and thousands of people are killed. When it is not just humans, but all living things are on the verge of disappearance, Godzilla comes to help, but even Godzilla is overwhelmed by Hedorah’s poisonous discharges.