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. Before it is caught in the explosion, the Robot Corps arrive carrying the complete Jet Scrander and Mazinger uses it to escape from ocean and into the sky. Back at the Kurogane House, Kouji admits he was wrong to mistreat his allies and resolves his dispute with the Robot Corps.
機械獣に捕まったさやかを盾に、投降を強いられる甲児。甲児達のさやか救出とサルード脱出作戦が始まる。
魔神Z遭到了俘虏甲儿也被赶紧了大牢里，得意的阿修罗男爵看着眼前的朋友号忍不住驾驶起来，但在合体的时候却失败了，感到丢脸的阿修罗男爵命令部下看守朋友号就离开了，躲在后面的波斯等人看准时机将守卫打晕了。在牢里的甲儿看似反省自己所做的一切，连同伴也无法拯救的他后悔没有听大家的话，这时波斯以两人出去之后干架为条件救出了甲儿。
Después de haber entregado Mazinger Z al Barón Ashura, Kouji es esposado y encerrado en una celda en la Fortaleza Submarina Saluud. Boss, Nuke y Mucha, por otro lado, lograron evitar ser detectados escondiéndose en el Pilder. Se escapan, derrotan a varios guardias y luego se disfrazan usando su uniforme para rescatar a Kouji y Sayaka. Sin embargo, después de liberar a Kouji, el Saluud es atacado por el Conde Brocken y comienza a hundirse. Finalmente, Boss y Kouji rescatan a Sayaka y regresan al Pilder y Mazinger. Sin embargo, antes de que puedan llegar allí, se enfrentan a la quinta y última hermana Gamia, que es derrotada por los esfuerzos conjuntos de Kouji y Sayaka. Luego, el grupo se sube a Mazinger Z y se prepara para escapar, pero no antes de que el Barón Ashura revele que había configurado la fortaleza para que se autodestruya. Para empeorar las cosas, cuando Mazinger Z escapa de la fortaleza, se queda atascado en el fondo blando del océano.
