100 million years ago, a human family from a prehistoric tribe, THE TROGS, discovers a hidden cave within a mountain. Inside are The DinoDroids, alien military vehicles designed to look like dinosaurs. When the Trog father, Agon, mother, Tala, and sons, Hurak, Bozok, and Tog, and sister, Nala climb into the control cockpits of the DinoDroids, a helmet descends onto their heads and suddenly imbues them with the knowledge to operate the alien vehicles. They lean that an advanced alien race from the planet Agena built the DinoDroids for Earthlings to discover and use to protect themselves against the coming invasion of Earth by a marauding extraterrestrial horde of plunder species called THRONG.