Sorry, we have not watched this yet.
Dr. Hamaguchi and Commander Oka visited a secret lab under a waterfall. They collected Voltes data to find solution to volt-in safely. Suddenly the Boazanians led by Heinell broke into the secret lab. The duo managed to escape, made "Ultra Magucon" device and implanted it in Volt Crewzer.
Sorry, we have not watched this yet.