Nick Adams
Astronaut F. Glenn
Akira Takarada
Astronaut K. Fuji
Kumi Mizuno
Miss Namikawa
Yoshio Tsuchiya
Controller of Planet X
Takamaru Sasaki
Chairman of Earth Committee (uncredited)
Gen Shimizu
Minister of Defense (uncredited)
Kenzô Tabu
Commander from Planet X (uncredited)
Yoshifumi Tajima
General (uncredited)
Shôichi Hirose
King Ghidorah
Toki Shiozawa
Tetsuo's Mother (uncredited)
Nadao Kirino
Military Aide (uncredited)
Kôji Uno
Namikawa's Associate (uncredited)
Tôru Ibuki
Xian (uncredited)
Kazuo Suzuki
Xian (uncredited)
Fuyuki Murakami
Councilman (uncredited)
Noriko Sengoku
Female Delegate (uncredited)
Someshô Matsumoto
Buddhist Priest (uncredited)
Kamayuki Tsubono
Councilman (uncredited)
Yasuhisa Tsutsumi
Official (uncredited)
Rinsaku Ogata
Scientist (uncredited)
Masaaki Tachibana
Scientist (uncredited)
Yutaka Oka
Reporter (uncredited)
Saburô Iketani
News Reader (uncredited)
Yoshizo Tatake
Xian (uncredited)
Mitsuo Tsuda
Xian (uncredited)
Ryôji Shimizu
Xian (uncredited)
Minoru Itô
Xian (uncredited)
Takuzō Kumagai
Xian (uncredited)
Tadashi Okabe
Reporter (uncredited)
Hideki Furukawa
Xian (uncredited)