Gezora, Ganime, Kameba: Kessen! Nankai no daikaijû is also called as Yog: Monster from Space, The Space Amoeba, Supesu Amîba, Monster des Grauens greifen an, Kessen! Nankai no daikaijû, Desafio dos Monstros, Atom il mostro della galassia, Aliens - Monster des Grauens greifen an。

A space probe is infiltrated by alien beings and then crashes on a remote Pacific atoll. A group planning to build a resort hotel land on the island and discover it to be inhabited by giant mutant monsters created by the aliens in an attempt to conquer the world.