Raymond Burr

Character: Steve Martin

Takashi Shimura

Character: Dr. Yamane

Momoko Kôchi

Character: Emiko Yamane

Akira Takarada

Character: Ogata

Akihiko Hirata

Character: Dr. Serizawa

Sachio Sakai

Character: Hagiwara

Fuyuki Murakami

Character: Dr. Tabata

Ren Yamamoto

Character: Seiji

Toyoaki Suzuki

Character: Shinkichi

Tadashi Okabe

Character: Dr. Tabata's Assistant

Toranosuke Ogawa

Character: President of Company

Frank Iwanaga

Character: Security Officer Tomo Iwanaga

Sammee Tong

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

James Hong

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

Mikel Conrad

Character: George Lawrence (uncredited)

Paul Frees

Character: Unidentified Character (voice) (uncredited)

Hiroshi Hayashi

Character: Chairman of Diet Committee (uncredited)

Ren Imaizumi

Character: Radio Operator (uncredited)

Kokuten Kōdō

Character: The Old Fisherman (uncredited)

Takeo Oikawa

Character: Chief of Emergency Headquarters (uncredited)

Tsuruko Mano

Character: The Boy's Mother (uncredited)

Kenji Sahara

Character: Man on Boat (uncredited)

Kin Sugai

Character: Ozawa-san (uncredited)

Lee Miller

Character: Man in Line at Airport (uncredited)

Haruo Nakajima

Character: Godzilla (uncredited)

Katsumi Tezuka

Character: Godzilla (uncredited)

Ryosaku Takasugi

Character: Godzilla (uncredited)