Space Amoeba (ゲゾラ・ガニメ・カメーバ 決戦！南海の大怪獣 Gezora Ganime Kamēba Kessen Nankai no Daikaijū, lit. Gezora, Ganimes, Kamoebas: Battle! Giant Monsters of the South Seas) is a 1970 tokusatsu kaiju film produced by Toho. The studio distributed it to Japanese theaters on August 1, 1970, as part of the Toho Champion Festival. American International Pictures brought it to the United States the following year, under the title Yog, Monster from Space. It was director Ishiro Honda's last film before he left his contract with Toho, and the first kaiju film made after the death of special effects director Eiji Tsuburaya. One of his protégés, Sadamasa Arikawa, acted as the director of special effects for this film. The story is set into motion when a mysterious alien lifeform takes command of the unmanned probe Helios 7, splashing down near a South Pacific island called Sergio. Mutating a cuttlefish, two stone crabs and a mata mata turtle into giant monsters, the alien wages war against the island's inhabitants and a group of Japanese visitors.