The Five Sibling Warriors (五兄弟戦士, Go Kyōdai Senshi?)
Gamerugin (ガメルギン Gamerugin) (1-2): This monster was responsible for separating the Hoshikawa siblings from their parents. It would later arrive on Earth as the first Galactic Beast to fight and be defeated by the Fivemen and destroyed by the Five Robo.