When the ISO intelligence office analyses a horn of a mecha which fell into the Mammoth Canyon, they conclude that with 80% probability the Galactor Headquarter is at the upper course of the Ielo river. Because the Ielo river is a gorge, the God Phoenix cannot fly into it, and Ryu is left with the God Phoenix at the entrance of the gorge. The other four head towards the upper course of the river in a canoe. However, on their way there somebody interferes with them. Elsewhere, this also becomes a hindrance to the Galactor operation of displaying the headquarter, thus luring the Science Ninja Team there. They capture the man.
Going up the river, they come across a sea deep below the earth, extending in the middle of a cave. However, it's the Galactor base. Just before the door in the ceiling closes, Jinpei escapes, but the other three are captured. Jinpei contacts the God Phoenix. Ryu is afraid somebody might listen in and pretends to be sleeping, not answering the call. Then he secretly takes off and steers the God Phoenix towards the base.
Caught in the base, the man hears what is said between the Science Ninja Team and Galactor. He seizes an opportunity and opens the ceiling. Jinpei immediately throws in a bomb and releases the bonds of Ken and the others. Taking the man with them, the four of them escape from the base. Ken orders to shoot a missile into the base. The Galactor base is blown up.
The man, having been rescued, tells them that in a fight between Galactor and the Science Ninja Team his willow at the bottom of the sea had been destroyed and he had taken it badly. However, he says that he made a mistake. Ken says that he knows that there are humans who are involved in his fight, and that the burden of his post weighs heavy on him.
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