Plot: San Francisco is threatened as a bizarre, quadrapedal multi-colored subterranean monster appears underneath the city. The creature is called the Eartheater, since it lives by devouring huge amounts of rock, soil, and steel, wreaking much havoc in the process by causing buildings and other man-made structures to collapse; the Eartheater also projects waves of sonic force from two antennae on top of its head to help it dig, but which can also be utilized as a formidable weapon in battle