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.
Casts:
Nick Adams, Akira Takarada, Keiko Sawai, Kumi Mizuno, Jun Tazaki, Akira Kubo, Yoshio Tsuchiya, Takamaru Sasaki, Gen Shimizu, Kenzō Tabu, Yoshifumi Tajima, Haruo Nakajima, Masaki Shinohara, Shôichi Hirose, Toki Shiozawa, Nadao Kirino, Kôji Uno, Tôru Ibuki, Kazuo Suzuki, Fuyuki Murakami, Noriko Sengoku, Someshō Matsumoto, Kamayuki Tsubono, Yasuhisa Tsutsumi, Rinsaku Ogata, Masaaki Tachibana, Yutaka Oka, Saburô Iketani, Yoshizo Tatake, Mitsuo Tsuda, Ryôji Shimizu, Minoru Itō, Takuzō Kumagai, Tadashi Okabe, Hideki Furukawa