Kenji Sahara

Shigeru Kawamura

Yumi Shirakawa

Kiyo

Akihiko Hirata

Professor Kyuichiro Kashiwagi

Minosuke Yamada

Mining Chief Osaki

Yoshifumi Tajima

Izeki

Akio Kobori

Police Chief Nishimura

Mitsuo Tsuda

Staff Officer Takeuchi

Ren Imaizumi

Sunagawa

Jun'ichirō Mukai

Military officer

Rinsaku Ogata

Goro

Ichirō Chiba

Chief of Police

Tsurue Ichimanji

Haru

Tateo Kawasaki

Tsunesan

Kanta Kisaragi

Suteyan

Tsuruko Mano

Osumi

Jirô Suzukawa

Yoshizo

Yasuhiro Shigenobu

Sabu

Keiji Sakakida

Tahei

Ichirō Nakatani

Senkichi

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)

Kiyoharu Onaka

Male Honeymooner, Sunagawa's friend (uncredited)

Yasuko Nakata

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)