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.

Cast:Akira Takarada, Nick Adams, Kumi Mizuno, Keiko Sawai, Jun Tazaki, Yoshio Tsuchiya,

Genre:Science Fiction, Action,

country:Japan, United States of America,

Production:TOHO, United Productions of America, Benedict Pictures Corp., Henry G. Saperstein Enterprises, Tokyo Laboratory,