Kagaku ninja tai Gatchaman

Dr. Miwa is researching whether the surface of the Sanjo Lake, frozen over the whole year, can be used to produce strong energy from the sun, instead of using polarization glas. Now he has gone missing. He had questions because this year the lake wasn't frozen over and seemed to have started an investigation. Nambu orders the Science Ninja Team to look for him since he fears the misuse of the Doctor's research, but also because the Doctor is his friend. The Science Ninja Team, led by the Doctor's pet Taro who was able to get to Nambu with a camera, heads towards the snowy mountains. There they discover a Galactor base. The Science Ninja Team and Taro are tricked by the Doctor's reflection. Taro is washed away by water falling from the ceiling of the base where the surface of the lake is located. The Science Ninja Team is locked up by walls made of reinforced glass. But with Taro's help the Science Ninja Team escapes and intervenes in the test area for the mecha using the Doctor's research. Ken's boomerang cuts through Katse's mask. Hiding his face, Katse flees. Ken, taking the Doctor with him, steals the enemy's snowmobiles and escapes from the base. Taro attacks the snowmobiles of the Galactor members about to assault the Doctor and the Doctor is saved, but Taro falls out of sight towards the bottom of the valley. Lenjira explodes because the Doctor is not present at the experiment. It disappears together with the base.