Kenji Sahara as Joji Atsumi

Yumi Shirakawa as Etsuko Shiraishi

Akihiko Hirata as Ryoichi Shiraishi

Momoko Kôchi as Hiroko Iwamoto

Yoshio Tsuchiya as Leader of the Mysterians

Takashi Shimura as Dr. Tanjiro Adachi

Yoshio Kosugi as Cmdr. Sugimoto

Susumu Fujita as Gen. Morita

Fuyuki Murakami as Dr. Nobu Kawanami

Yutaka Sada as Police Capt. Miyamoto

Hisaya Itō as Army Capt. Seki

Tetsu Nakamura as Dr. Koda

Sōji Ubukata as Dr. Noda

George Furness as Dr. Svenson

Harold Conway as Dr. De Gracia

Heihachirō Ōkawa as Person at Board Meeting

Ren Imaizumi as Adachi's Assistant Hayami

Rikkie Sanjô as Etsuko's mother

Tadao Nakamaru as 1st. Lt. Yamamoto

Hideo Saeki as Gen. Emoto

Takuzō Kumagai as Colonel Ito

Akio Kusama as Police Station Chief Togawa

Shin Ōtomo as Policeman Kawada

Rinsaku Ogata as Policeman Ogata

Takeo Oikawa as Announcer on TV

Mitsuo Tsuda as Person at Defense Meeting

Kamayuki Tsubono as Defense Meeting Attendee

Senkichi Ōmura as Doomed Villager

Haruya Katō as Doomed Villager

Yasuhiro Shigenobu as Doomed villager

Shōichi Hirose as Detective in Etsuko's house

Eisuke Nakanishi as Detective in Etsuko's house

Keiichirō Katsumoto as Detective

Jirô Mitsuaki as Detective

Ryûtarô Amami as Policeman

Saburô Kadowaki as Policeman

Masayoshi Kawabe as Policeman

Mitsuo Matsumoto as Newspaper Reporter

Hideo Unagami as Mysterian

Katsumi Tezuka as Mysterian

Haruo Nakajima as Giant Robot

Ikio Sawamura as

Sachio Sakai as

Gen Shimizu as

Yasuhisa Tsutsumi as

Jun Tazaki as

Hideo Shibuya as

Yoshibumi Tajima as