Akira Takarada

Astronaut Kazuo Fuji

Nick Adams

Astronaut F. Glenn

Kumi Mizuno

Miss Namikawa

Keiko Sawai

Haruno Fuji

Jun Tazaki

Dr. Sakurai

Yoshio Tsuchiya

Controller of Planet X

Akira Kubo

Tetsuo Torii

Takamaru Sasaki

Chairman of Earth Committee

Fuyuki Murakami

Medical Representative

Yoshibumi Tajima

Mobile Commander

Kenzō Tabu

President of World Education Corporation (Xilien)

Noriko Sengoku

Delegate

Someshō Matsumoto

Buddhist Representative

Gen Shimizu

Minister of Defense

Tōru Ibuki

Earth Base Xilien

Kazuo Suzuki

Earth Base Xilien

Yasuhisa Tsutsumi

Captain of First Survey Corps

Nadao Kirino

Captain of Second Survey Corps

Toki Shiozawa

Tetsuo's Mother

Mitsuo Tsuda

JSDF Soldier / Xilien

Takuzō Kumagai

JSDF Soldier / Xilien

Kôji Uno

Namikawa's Associate (Earth Base Xilien)

Masaaki Tachibana

Scientist

Yutaka Oka

Reporter

Rinsaku Ogata

JSDF Soldier

Tadashi Okabe

World Space Agency Staff

Ryôji Shimizu

World Space Agency Staff

Hideki Furukawa

World Space Agency Staff

Kamayuki Tsubono

Reporter

Minoru Itō

Reporter / Xilien

Haruo Nakajima

Godzilla

Masaki Shinohara

Rodan

Shōichi Hirose

King Ghidorah

Gorō Naya

Astronaut F. Glenn (voice)

Saburô Iketani

News Announcer (uncredited)

Yoshizo Tatake

Xilien (uncredited)

Yoshio Katsube

World Education Corporation Member (Earth Base Xilien) (uncredited)

Akira Wakamatsu

World Education Corporation Member (Earth Base Xilien) (uncredited)

Haruya Sakamoto

JSDF Soldier (uncredited)