A uranium mining factory at the bottom of the sea is attacked by the mecha "Kingdragon". Since a guard vessel with much more power than the God Phoenix was beaten during the attack, Nambu does not order the Science Ninja Team deployed. But Ken disobeys Nambu's orders and goes to face the mecha in the God Phoenix.
But the God Phoenix is no match against the enemy and even their trump card, the firebird, is beaten by the much higher temperatures.
Nambu orders the Red Impulse group to attack the mecha, but the Red Impulse commander believes that Ken should face the enemy again and refuses Nambu's order.
So Nambu comes up with another plan. He wants to install a cooling device in the God Phoenix, which is then supposed to react with a minus bomb to be installed in the interior of the mecha to freezing the enemy. Knowing this will be very dangerous, Ken applies for the job of installing the minus bomb.
Hiding in a swarm of tuna, Ken sneaks into the mecha. He succeeds in placing the bomb, but he has no more time to escape as the mecha starts to freeze from the icy firebird.
The Science Ninja Team is worried and wondering about Ken, when he suddenly appears in front of them from a crack in the mecha, like an immortal bird.
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