Yōsuke Natsuki

Detective Shindo

Yuriko Hoshi

Naoko Shindo

Hiroshi Koizumi

Professor Murai

Takashi Shimura

Dr. Tsukamoto

Emi Ito

Shobijin

Yumi Ito

Shobijin

Akiko Wakabayashi

Princess Maas Doulina Salno of Selgina

Hisaya Ito

Chief Assassin Malmess

Akihiko Hirata

Chief Detective Okita

Minoru Takada

Prime Minister (uncredited)

Ikio Sawamura

Honest Fisherman (uncredited)

Kōzō Nomura

Geologist (uncredited)

Kenji Sahara

Editor in Chief Kanamaki

Susumu Kurobe

Assassin with Mustache (uncredited)

Tōru Ibuki

Short-Tie Assassin (uncredited)

Kazuo Suzuki

Door-Opener Assassin (uncredited)

Haruya Katō

Journalist (uncredited)

Shin Ōtomo

Boss of Assassins (uncredited)

Senkichi Ōmura

Would-Be Hat Retriever (uncredited)

Yutaka Nakayama

Tourist with Lost Hat (uncredited)

Heihachirō Ōkawa

Astronomer (uncredited)

Hideyo Amamoto

Princess Salno's aide (uncredited)

Yoshio Kosugi

Chief of Infant Island (uncredited)

Yoshifumi Tajima

Ship Captain (uncredited)

Kotaro Tomita

Villager (uncredited)

Yuriko Hanabusa

Mother Shindo (uncredited)

Hideo Shibuya

Journalist (uncredited)

Haruo Nakajima

Godzilla (uncredited)

Shōichi Hirose

King Ghidorah (uncredited)