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.
Nick Adams
as Astronaut F. Glenn
宝田明
as Astronaut K. Fuji
沢井桂子
as Haruno Fuji
水野久美
as Miss Namikawa
田崎潤
as Dr. Sakurai
久保明
as Tetsuo Teri
土屋嘉男
as Controller of Planet X
佐々木孝丸
as Chairman of Earth Committee
清水元
as Minister of Defense
田武謙三
as Commander from Planet X
田島義文
as General
中島春雄
as Godzilla
