Note : 1977 is an estimated year. This film appears to have been made around the late 1970s, close to the time of Mighty Peking Man.
Year 1929. The discovery of the skull of Peking Man scares the Japanese because, it is alleged, its existence would challenge the foundation myth of the emperor and, therefore, of the Japanese themselves. So they send a crack unit to China to destroy the specimen. But the Chinese won't give up without a fight.