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 is captured by the robot inhabitants of Ruca, a race that has done away with humans. The robots recognise Gran, with her robotic leg, as being almost like them. They confide in Gran and, with her inside knowledge, she is able to save the kids from being exterminated. Show less