Steggy comes from a world where all dinosaur species lived together as one. The scientists and researchers establish a project to explore worlds beyond their own. The Earth has the requirements necessary to support life. A squadron of spaceships is sent to the world to investigate, but sometime after landing, all radio contact is lost and all further exploration is called off. But Steggy is intent on finding out what had happened to his ancestors. Bringing a large supply of food packs, he boards the remaining exploring ship and sets a course for Earth.