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, the team washes them away by breaking a nearby dam and using the force of the water. Upon analyzing an ant the team brought back to the base, it learns 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 inside. Kattse is waiting for them where they fall and are captured in a dome made of reinforced glass. The air is about to run out, and they don't know what to do, but in the end, the team barely escapes by using a bomb. In the meantime, swarms of ants have attacked the streets, but the Reddo Imparusu squad exterminates them with flamethrowers.
At this time, Kattse lets a huge ant-shaped mecha take off. Reddo Imparus 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 Kattse gets escapes.