Steve Martin

Raymond Burr

Shinkichi (as Tuyoaki Suzuki)

Toyoaki Suzuki

Security Officer Tomo Iwanaga (as Frank Iwaiga)

Frank Iwanaga

Ogata (as Akiro Takarata)

Akira Takarada

Dr. Serizawa

Akihiko Hirata

Hagiwara

Sachio Sakai

Dr. Yamane

Shimura Takashi

Dr. Yamane

Takashi Shimura

Emiko Yamane (as Momaku Kuchi)

Momoko Kôchi

Dr. Tabata (uncredited)

Fuyuki Murakami

Seiji (uncredited)

Ren Yamamoto

George Lawrence

Mikel Conrad

President of Company

Toranosuke Ogawa

Dr. Tabata's Assistant (uncredited)

Tadashi Okabe

The Old Fisherman (uncredited)

Kokuten Kōdō

The Old Fisherman

Kuninori Kodo

Man on Boat (uncredited)

Kenji Sahara

Godzilla (uncredited)

Haruo Nakajima

Godzilla (uncredited)

Katsumi Tezuka

Unidentified Character (voice)

Raymond Royer

Unidentified Character

Michel Francois

Unidentified Character (voice)

Michel François

Unidentified Character (voice)

Roland Ménard

Unidentified Character

Rene Blancart

Unidentified Character (voice)

René Blancard

Unidentified Character (voice)

Maurice Favières

Unidentified Character (voice)

Eddy Rasimi

Odo Islander (uncredited)

Yasuhisa Tsutsumi

Sailor playing harmonica on Eiko Maru (uncredited)

Kenzo Echigo

Eiko Maru crewmember (uncredited)

Masaki Shinohara

Eiko Maru wireless communications officer (uncredited)

Yū Fujiki

Male family member of missing sailors (uncredited)

Tokio Ôkawa

Substation worker (uncredited)

Ishirō Honda

Representative (uncredited)

Shōichi Hirose

Assistant to announcer on Shikine (uncredited)

Kōji Uruki