Raymond Burr

Steve Martin

Takashi Shimura

Dr. Yamane

Momoko Kôchi

Emiko Yamane

Akira Takarada

Ogata

Akihiko Hirata

Dr. Serizawa

Sachio Sakai

Hagiwara

Fuyuki Murakami

Dr. Tabata

Ren Yamamoto

Seiji

Toyoaki Suzuki

Shinkichi

Tadashi Okabe

Dr. Tabata's Assistant

Toranosuke Ogawa

President of Company

Frank Iwanaga

Security Officer Tomo Iwanaga

Sammee Tong

Dr. Yamane / Dr. Tabata (voice) (uncredited)

James Hong

Ogata / Dr. Serizawa / Hagiwara (voice) (uncredited)

Mikel Conrad

George Lawrence (uncredited)

Paul Frees

Unidentified Character (voice) (uncredited)

Hiroshi Hayashi

Chairman of Diet Committee (uncredited)

Ren Imaizumi

Radio Operator (uncredited)

Kokuten Kōdō

The Old Fisherman (uncredited)

Takeo Oikawa

Chief of Emergency Headquarters (uncredited)

Tsuruko Mano

The Boy's Mother (uncredited)

Kenji Sahara

Man on Boat (uncredited)

Kin Sugai

Ozawa-san (uncredited)

Lee Miller

Man in Line at Airport (uncredited)

Haruo Nakajima

Godzilla (uncredited)

Katsumi Tezuka

Godzilla (uncredited)

Ryosaku Takasugi

Godzilla (uncredited)