Animation. Dogstar is a spaceship that contains all of earth's dogs, lost during the move from Old Earth to New Earth. The Clark kids miss their dog Hobart and, on board the Valiant, they go in pursuit of the Dogstar. The Valiant lands on planet Ruca again - but on this visit the crew have journeyed back in history to a time before the robots rose up to overthrow their masters, including a nine-year-old lunatic emperor. Show less