Five robots crash-land their space ship in Earth"s Jurassic jungle! They wait for millions of years for their rescuers to arrive, but when they do they find that the new robots are far more advanced than they - and they"re obsolete! Discovering the new robot"s plan to turn them into scrap back home, our quintet enlists the aid of primitive humans to fight off their rescuers, electing to stay on Earth and teach man about the universe.