S1·E21 The Tactic of Creating A Secret Base (Sakubou no Himitsu Kichi- 策略の秘密基地)

Dr. Gou was rescued by Voltes team after they infiltrated Zuuru's undersea base and then brought to Big Falcon, but Gou was suspicious. Soon he realized that all the Big Falcon, Voltes team, and even Sakunji were just fake dummies planned by Zuuru to get Voltes secret from him.