Astronauts Glenn and Fuji investigate Planet X and encounter mysterious aliens known as the Xiliens, who ask Earth's people to help save their world from "Monster Zero". In exchange for borrowing Godzilla and Rodan, the Xiliens offer a cure for cancer. As Glenn investigates, he develops a romance with Miss Namikawa and uncovers the Xilien's true intentions.
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Invasion of Astro-Monster (怪獣大戦争, Kaijū Daisensō, lit. 'The Giant Monster War') is a 1965 kaiju film directed by Ishirō Honda, with special effects by Eiji Tsuburaya. It is the sixth film in the Godzilla franchise and Shōwa period. The film was a Japanese-American co-production; it was the second collaboration between Toho Co., Ltd and UPA. The film stars Akira Takarada, Nick Adams, Kumi Mizuno, Akira Kubo, and Yoshio Tsuchiya, with Haruo Nakajima as Godzilla, Masaki Shinohara as Rodan, and Shoichi Hirose as King Ghidorah. In the film, aliens plead with humanity to borrow Godzilla and Rodan to defeat King Ghidorah, only to betray the humans and unleash the monsters on the Earth.
Invasion of Astro-Monster was theatrically released in Japan on December 19, 1965. It was followed by a theatrical release in the United States on July 29, 1970 by Maron Films as Monster Zero, on a double bill with The War of the Gargantuas.
The film was followed by Ebirah, Horror of the Deep, released on December 17, 1966.