Hiroshi Koizumi as Shoichi Tsukioka

Setsuko Wakayama as Hidemi Yamaji

Minoru Chiaki as Kôji Kobayashi

Takashi Shimura as Kyohei Yamane-hakase

Masao Shimizu as Zoologist Dr. Tadokoro

Seijirô Onda as Captain Terasawa of Osaka Defense Corps

Sonosuke Sawamura as Hokkaido Branch Manager Shingo Shibeki

Yoshio Tsuchiya as Tajima, Member of Osaka Defense Corps

Mayuri Mokushô as Radio Operator Yasuko Inouye

Minosuke Yamada as Chief of Civil Defense

Yukio Kasama as Koehi Wamaji, President of the Fishery

Senkichi Ōmura as Small Escaped Convict

Ren Yamamoto as Commander of Landing Craft

Shin Ōtomo as Convict Leader

Takeo Oikawa as Osaka Municipal Police Commissioner

Shōichi Hirose as Convict

Teruko Mita as 'Yayoi' Madam

Haruo Nakajima as Godzilla

Katsumi Tezuka as Anguirus

Miyoko Hoshino as Cabaret Singer

Toku Ihara as Policeman

Takuzō Kumagai as Hokkai-Maru Captain

Tadao Nakamaru as Policeman

Hideo Shibuya as Visitor of Cabaret

Shigemi Sunagawa as Visitor of Cabaret

Masaaki Tachibana as Policeman

Kôji Uno as Shibeki's Assistant

Shin Yoshida as Convict