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.

Akira Takarada
as Astronaut Kazuo Fuji

Nick Adams
as Astronaut F. Glenn

Kumi Mizuno
as Miss Namikawa

Keiko Sawai
as Haruno Fuji

Jun Tazaki
as Dr. Sakurai

Yoshio Tsuchiya
as Controller of Planet X

Akira Kubo
as Tetsuo Torii

Takamaru Sasaki
as Chairman of Earth Committee

Fuyuki Murakami
as Medical Representative

Yoshibumi Tajima
as Mobile Commander
John Chard
We need from you Monster Zero 1 and Monster Zero 2, Godzilla and Rodan. It's one of those Godzilla movies where you fully understand why some fans of the "Zilla" series positively dislike it. The big atomic lizard is only a bit part player here, and when push comes to shove the monster mayhem is ...