Raymond Burr as Steven Martin

Keiju Kobayashi as Prime Minister Mitamura

Ken Tanaka as Goro Maki

Yasuko Sawaguchi as Naoko Okumura

Shin Takuma as Hiroshi "Ken" Okumura

Warren J. Kemmerling as General Goodhue

James Scott Hess as Colonel Raschen

Travis Swords as Major McDonough

Eitarō Ozawa as Finance Minister Kanzaki

Taketoshi Naitō as Takegami, Chief Cabinet Secretary

Nobuo Kaneko as Home Affairs Minister Isomura

Mizuho Suzuki as Foreign Minister Emori

Takeshi Katō as Internal Trade and Industry Minister Kasaoka

Sho Hashimoto as Captain of Super X

Junkichi Orimoto as Director-General of the Defense Agency

Yoshifumi Tajima as Environmental Director General Hidaka

Hiroshi Koizumi as Geologist Minami

Kunio Murai as Secretary Henmi

Shigeo Katō as Ship Captain

Kei Satō as Gondo

Takenori Emoto as Kitagawa

Chinpei Hayashiya as Cameraman Kamijo (as Shinpei Hayashiya)

Koji Ishizaka as Member of the Staff of a Nuclear Power Plant

Tetsuya Takeda as Tramp

Crawford Binion as Lieutenant

Justin Gocke as Kyle

Yōsuke Natsuki as Biologist Hayashida

Kenpachirō Satsuma as Godzilla (uncredited)

Akira Toriyama as Man fleeing from Godzilla (uncredited)