Keiju Kobayashi as Prime Minister Seiki Mitamura

Ken Tanaka as Goro Maki

Yasuko Sawaguchi as Naoko Okumura

Shin Takuma as Hiroshi Okumura

Yōsuke Natsuki as Professor Makoto Hayashida

Eitarō Ozawa as Minister of Finance Kanzaki

Taketoshi Naitō as Chief Cabinet Secretary Takegami

Nobuo Kaneko as Home Affairs Minister Isomura

Mizuho Suzuki as Foreign Minister Emori

Junkichi Orimoto as Director-General of the Defense Agency

Hiroshi Koizumi as Professor Minami

Kunio Murai as Secretary Henmi

Kei Satō as Chief Editor Gondo

Shigeo Katō as Captain of the Yahata Maru

Walter Nichols as Rosenburg, Special Envoy for the President of the United States

Alexander Kilis as Chefsky, Special Envoy for the Soviet Union

Takenori Emoto as Desk Editor Kitagawa

Koji Ishizaka as Power plant guard

Tetsuya Takeda as Homeless man

Joe Raznack as Kramer, American Ambassador (uncredited)

Joseph Grace as Zazimov, Soviet Ambassador (uncredited)

Kenpachirō Satsuma as Godzilla

Akira Toriyama as Man fleeing from Godzilla (uncredited)

Yuji Horii as Man fleeing from Godzilla (uncredited)

Akira Sakuma as Man fleeing from Godzilla (uncredited)