The Big Battle of the Underground Monsters

Suddenly, a whole city has lost power. Ken, in his Cessna, is thinking about an anomaly in the power plant when he gets a message from Nambu that the nuclear power plant has been attacked by a large group of ants. The Science Ninja Team goes to the site in question, but since the missiles would have hardly any effect on the tiny groups, they wash them away by breaking a nearby dam and using the force of the water. Upon analysing an ant they brought back, they learn that it's a finely and precisely manufactured robot. The robot ant gets repaired and, following its control signal, returns to its base. It is followed by Ryu in the God Phoenix in the sky and by the other four on the ground. They soon discover huge ant-hills, and end up in a huge ant cave when they try to sneak in. Katse is waiting for them where they fall and captures them in a dome made of reinforced glas. The air is about to run out and they don't know what to do, but in the end barely escape by using a bomb. In the meantime, swarms of ants have attacked the streets, but the Red Impulse squad exterminates them with flamethrowers. At this time, Katse lets a huge ant mecha take off. Red Impulse and the God Phoenix drive the ant mecha into an underwater tunnel. Collecting the sunlight with a mirror built into its nose, the God Phoenix burns everything with a strong heat ray. But Katse gets away again.

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