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Having surrendered Mazinger Z to Baron Ashura, Kouji is handcuffed and locked in a cell in Undersea Fortress Saluud. Boss, Nuke and Mucha on the other hand, managed to avoid detection by hiding in the Pilder. They break out, defeat several guards and then disguise themselves using their uniform to rescue Kouji and Sayaka. After freeing Kouji however, the Saluud comes under attack from Count Brocken and begins to sink. Eventually, Boss and Kouji rescue Sayaka and make it back to the Pilder and Mazinger. Before they can get there though, they are confronted by the fifth and final Gamia sister who is defeated by the joint efforts of Kouji and Sayaka. The group then get in Mazinger Z and prepare to escape, but not before Baron Ashura reveals that he had set the fortress to self-destruct. To make matters worse, when Mazinger Z escapes the fortress it becomes stuck in the soft ocean floor.
Ayumi Fujimura
Shiro Kabuto
Kenji Akabane
Kouji Kabuto
Kazuhiko Kishino
Dr. Hell (voice)
Atsushi Imaruoka
Ankokuji Keiji
Fumihiro Awano
Tetsuya Tsurugi
Hiroshi Naka
Yanosuke Yumi
Kaori Yamagata
Baron Ashura
Kenji Utsumi
Emperor of Darkness
Masaaki Yajima
Zeus
Masayuki Katou
Yasu the Weasel
Minoru Inaba
Count Blocken
Satsuki Yukino
Gamia Q
Seiko Tomoe
Kikunosuke
Tessyo Genda
Cross
Youko Honda
Sayaka Yumi
Miyuki Ichijou
Tsubasa Nishikiori (voice)
Taimei Suzuki
Jūzō Kabuto