Kenji Sahara
Shigeru Kawamura
Akihiko Hirata
Professor Kyuichiro Kashiwagi
Minosuke Yamada
Mining Chief Osaki
Akio Kobori
Police Chief Nishimura
Mitsuo Tsuda
Staff Officer Takeuchi
Jun'ichirō Mukai
Military officer
Ichirō Chiba
Chief of Police
Kiyoshi Takagi
Dr. Minakami (uncredited)
Fuyuki Murakami
Professor Minami (uncredited)
Mitsuo Matsumoto
Professor Isokawa (uncredited)
Takuzō Kumagai
Policeman Tashiro (uncredited)
Yasuhisa Tsutsumi
Imamura, F-86F pilot (uncredited)
Yutaka Oka
Kitahara, F-86F pilot (uncredited)
Shigemi Sunagawa
F-86F pilot (uncredited)
Katsumi Tezuka
Rodan / Meganulon / Hotel Manager
Haruo Nakajima
Rodan / Meganulon
Shōichi Hirose
Meganulon / Fighter pilot
Saburô Kadowaki
Sunagawa's colleague (uncredited)
Yasuko Nakada
Female Honeymooner (uncredited)
Junnosuke Suda
Coroner (uncredited)
Toshiko Nakano
Kiyo's neighbor (uncredited)
Saburô Iketani
News Reader (uncredited)
Saeko Kuroiwa
Nurse (uncredited)
Bontarō Taira
Laborer (uncredited)
Keiichirô Katsumoto
Coal mine employee (uncredited)
Kamayuki Tsubono
Policeman at crime laboratory (uncredited)
Mike Daneen
Okinawan correspondent (uncredited)
Masaaki Tachibana
Policeman (uncredited)
Tadashi Okabe
Journalist (uncredited)
Kôji Uno
Reporter (uncredited)
Akira Yamada
Radio operator on jeep (uncredited)
Ren Yamamoto
Soldier in jeep (uncredited)
Tokio Ôkawa
Meganulon (uncredited)
Seiji Onaka
Nakagawa, male honeymooner