Raymond Burr

Steve Martin

Frank Iwanaga

Security Officer Tomo Iwanaga (as Frank Iwaiga)

宝田明

Ogata (as Akiro Takarata)

平田昭彦

Dr. Serizawa

堺左千夫

Hagiwara

志村喬

Dr. Yamane

河内桃子

Emiko Yamane (as Momaku Kuchi)

村上冬樹

Dr. Tabata (uncredited)

山本廉

Seiji (uncredited)

Mikel Conrad

George Lawrence (uncredited)

小川虎之助

President of Company (uncredited)

岡部正

Dr. Tabata's Assistant (uncredited)

高堂国典

The Old Fisherman (uncredited)

佐原健二

Man on Boat (uncredited)

中島春雄

Godzilla (uncredited)

手塚勝巳

Godzilla (uncredited)

René Blancard

Unidentified Character (voice)

Maurice Favières

Unidentified Character (voice)

Eddy Rasimi

Unidentified Character (voice)