Shigeru Kawamura / Sunagawa / Toji (voice)

Keye Luke

Shigeru Kawamura

Kenji Sawara

Kiyo / woman outside hospital / female honeymooner (voice)

Aya Oyama

Kiyo

Yumi Shirakawa

Dr. Kyuichiro Kashiwagi / Izeki / male honeymooner (voice)

George Takei

Professor KYUichiro Kashiwagi

Akihiko Hirata

Police Chief Nishimura

Akio Kobori

Mining Chief Osaki

Minosuke Yamada

Nishimura / Suda / Dr. Tanaka / Air Force officer / Kitahara (voice)

Paul Frees

Female Honeymooner

Yasuko Nakata

Izeki

Yoshibumi Tajima

Air Self-Defense Force commander / Air Force pilot / newsreader (voice)

Marvin Miller

Osaki / Professor Minami / hotel manager / farmer (voice)

James Yagi

Staff Officer Takeuchi

Mitsuo Tsuda

Otami (voice)

Jane Chang

Sunagawa

Ren Imaizumi

Male Honeymooner

Kiyoharu Ohnaka

Narrator

David Duncan

Haru

Tsurue Ichimonji

Rodan / Meganulon (uncredited)

Haruo Nakajima

Military officer

Jun'ichirō Mukai

Goro

Rinsaku Ogata

Chief of Police

Ichirô Chiba

Haru

Tsurue Ichimanji

Tsunesan

Tateo Kawasaki

Suteyan

Kanta Kisaragi

Osumi

Tsuruko Mano

Yoshizo

Jirô Suzukawa

Sabu

Yasuhiro Shigenobu

Tahei

Keiji Sakakida

Senkichi

Ichirô Nakatani

Dr. Minakami (uncredited)

Kiyoshi Takagi

Professor Minami (uncredited)

Fuyuki Murakami

Professor Isokawa (uncredited)

Mitsuo Matsumoto

Policeman Tashiro (uncredited)

Takuzō Kumagai

Imamura, F-86F pilot (uncredited)

Yasuhisa Tsutsumi

Kitahara, F-86F pilot (uncredited)

Yutaka Oka

F-86F pilot (uncredited)

Shigemi Sunagawa

Rodan / Meganulon / Hotel Manager

Katsumi Tezuka

Meganulon / Fighter pilot

Shôichi Hirose

Sunagawa's colleague (uncredited)

Saburô Kadowaki

Female Honeymooner (uncredited)

Yasuko Nakada

Coroner (uncredited)

Junnosuke Suda

Kiyo's neighbor (uncredited)

Toshiko Nakano

News Reader (uncredited)

Saburô Iketani

Nurse (uncredited)

Saeko Kuroiwa

Laborer (uncredited)

Bontarō Taira

Coal mine employee (uncredited)

Keiichirō Katsumoto

Policeman at crime laboratory (uncredited)

Kamayuki Tsubono

Okinawan correspondent (uncredited)

Mike Daneen

Policeman (uncredited)

Masaaki Tachibana

Journalist (uncredited)

Tadashi Okabe

Reporter (uncredited)

Kôji Uno

Radio operator on jeep (uncredited)

Akira Yamada

Soldier in jeep (uncredited)

Ren Yamamoto

Meganulon (uncredited)

Tokio Ôkawa

Nakagawa, male honeymooner

Seiji Onaka

Male Honeymooner

Kiyoharu Onaka