Yōsuke Natsuki as Detective Shindo

Yuriko Hoshi as Naoko Shindo

Akiko Wakabayashi as Mas Selina Salno

Hisaya Ito as Malmess, Chief Assassin

Hiroshi Koizumi as Professor Miura

Takashi Shimura as Dr. Tsukamoto

Yumi Ito as Shobijin

Emi Ito as Shobijin

Akihiko Hirata as Chief Detective Okita

Minoru Takada as Prime Minister (uncredited)

Someshō Matsumoto as Alien Expert (uncredited)

Ikio Sawamura as Honest Fisherman (uncredited)

Kōzō Nomura as Geologist (uncredited)

Kenji Sahara as Editor in Chief Kanamaki

Susumu Kurobe as Assassin with Mustache (uncredited)

Tōru Ibuki as Short-Tie Assassin (uncredited)

Kazuo Suzuki as Door-Opener Assassin (uncredited)

Haruya Katō as Journalist (uncredited)

Shin Ōtomo as Boss of Assassins (uncredited)

Senkichi Ōmura as Would-Be Hat Retriever (uncredited)

Yutaka Nakayama as Tourist with Lost Hat (uncredited)

Heihachirō Ōkawa as Astronomer (uncredited)

Hideyo Amamoto as Princess Salno's aide (uncredited)

Yoshio Kosugi as Chief of Infant Island (uncredited)

Yoshifumi Tajima as Ship Captain (uncredited)

Yutaka Oka as Meteoritic (uncredited)

Kôji Uno as Hotel Clerk (uncredited)

Shigeki Ishida as Man in Crowd (uncredited)

Toshihiko Furuta as Villager (uncredited)

Kotaro Tomita as Villager (uncredited)

Ichiya Aozora as Self / TV Host (uncredited)

Senya Aozora as Self / TV Host (uncredited)

Yuriko Hanabusa as Mother Shindo (uncredited)

Hideo Shibuya as Journalist (uncredited)

Haruo Nakajima as Godzilla (uncredited)

Shōichi Hirose as King Ghidorah (uncredited)

Masaki Shinohara as Rodan (uncredited)

Kōji Uruki as Rodan (uncredited)