Kagaku ninja tai Gatchaman

A spaceship from Earth is suddenly attacked by meteorites, and the Science Ninja Team hurries to the bottom of the sea, to the spot where the meteorites fell. But there, mysterious robots that arrived a bit earlier, are already collecting the meteorites. Is it Galactor...?? Joe follows the robots and corners them, but they are not Galactor. On the contrary, they greet him as "brother". They are cyborgs as well who have been made by Dr. Raphael. A cyborg who introduces himself as Ulf leads him to their colony. There he meets Ulf's comrades, who are equally friendly, as well as Dr. Raphael. Then he learns that they want to invite him to a strength experiment. Before Joe's eyes, many cyborgs die when they are tested under extremely hard conditions. Then Joe is called by Ken and has to return to G-Town. Elsewhere, Galactor has noticed the existence of Ulf and the others. Using the meteorite's guidance system, they let meteorites fall onto the colony and destroy it.