Old Dog New Tricks. 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. And no wonder the robots later revolted. Ruca of the past was run by some very nasty people, including a nine-year-old lunatic emperor. Amazingly, Gemma's the one who finds a way to his heart.