Nick Adams
Astronaut F. Glenn
Akira Takarada
Astronaut K. Fuji
Yoshio Tsuchiya
Controller of Planet X
Takamaru Sasaki
Chairman of Earth Committee
Gen Shimizu
Minister of Defense
Kenzō Tabu
Commander from Planet X
Shōichi Hirose
King Ghidorah
Gorō Naya
Astronaut F. Glenn (voice)
Toki Shiozawa
Tetsuo's Mother
Nadao Kirino
Military Aide
Kôji Uno
Namikawa's Associate
Fuyuki Murakami
Councilman
Noriko Sengoku
Female Delegate
Someshō Matsumoto
Buddhist Priest
Kamayuki Tsubono
Councilman
Yasuhisa Tsutsumi
Official
Masaaki Tachibana
Scientist
Saburô Iketani
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