The Sea Devil Jumboshakoku

While a Galactor mech is mobilized, one of the small planes loses speed and collides with the fisher boat on which Ryu's father is. The boat is shipwrecked. When Ryu's younger brother Seiji hurries to Ryu's whereabouts and tells him of his father's shipwreck, Nambu's mobilization order goes out. Ryu desperately shakes his brother off, who is crying and clinging to him. But he ends up being late for the mobilization and the main research institute is already destroyed. Shortly thereafter, while they are doing bodyguard duty for a tanker, Ryu is worrying about his father's shipwreck as well and misses the course. In the meantime, the tanker has been attacked. Nambu scolds him that he didn't do his best. Ken defends Ryu and tells Nambu that they are not robots which just follow orders. Nambu tells them that they are under house arrest. However, Ken and Jun hear from Seiji about the shipwreck of Ryu's father and go out in the God Phoenix searching for the father without Nambu's orders. On one of the Amana islands they discover smoke and save Ryu's father and his comrades who are safe and sound. At that time, Ryu's father, without knowing that Ryu is his son, tells them the weakness of the mecha. Namely - when the small planes detach themselves from the main part of the mecha, the interior becomes visible. Aiming at an uranium store, the mecha appears again. The God Phoenix is mobilized. As he learned from his father, Ryu makes a rocket hit right on target into the main part of the mecha right after the small planes have detached themselves. The mecha is defeated.