Space Amoeba is a 1970 Japanese kaiju film directed by Ishirō Honda, written by Ei Ogawa, and produced by Tomoyuki Tanaka and Fumio Tanaka, with special effects by Sadamasa Arikawa. Produced and distributed by Toho Studios, the film stars Akira Kubo, Atsuko Takahashi, Yukiko Kobayashi, Kenji Sahara, Yoshio Tsuchiya, and Yu Fujiki, with Haruo Nakajima portraying both Gezora and Ganimes.
Space Amoeba tells the story of amoeba-like extraterrestrials that hijack a space probe and, after crash landing on an atoll in the Pacific Ocean, create gigantic monsters from native lifeforms for the purpose of conquering the Earth. The film was released theatrically in Japan on 1 August 1970, and received a theatrical release in the United States in 1971 by American International Pictures, under the title Yog: Monster From Space.