- Yôsuke Natsuki
- Detective Shindo
- Yuriko Hoshi
- Naoko Shindo
- Hiroshi Koizumi
- Professor Miura
- Akiko Wakabayashi
- Princess Selina Salno of Sergina
- Emi Itô
- Shobijin (Twin Fairy)
- Yumi Itô
- Shobijin (Twin Fairy)
- Takashi Shimura
- Dr. Tsukamoto
- Akihiko Hirata
- Chief Detective Okita
- Hisaya Itô
- Malmess, Chief Assassin
- Minoru Takada
- Prime Minister
- Someshô Matsumoto
- Alien Expert
- Ikio Sawamura
- Honest Fisherman
- Kôzô Nomura
- Geologist
- Kenji Sahara
- Editor in Chief Kanamaki
- Susumu Kurobe
- Moustachoied Assassin
- Tôru Ibuki
- Short-Tie Assassin
- Kazuo Suzuki
- Showoff Door-Opener Assassin
- Haruya Katô
- Journalist
- Shin Ãtomo
- Boss of Assassins
- Senkichi Ãmura
- Would-Be Hat Retriever
- Yutaka Nakayama
- Tourist with Lost Hat
- Heihachirô Ôkawa
- Astronomer
- Yutaka Oka
- Meteorite Scientist
- Hideyo Amamoto
- Princess Salno's aide
- Yoshio Kosugi
- Chief of Infant Island
- Yoshifumi Tajima
- Heedless Ship Captain
- Kôji Uno
- Hotel Clerk
- Shigeki Ishida
- Guy in Crowd
- Toshihiko Furuta
- Villager
- Kôtarô Tomita
- Villager
- Ichiya Aozora
- Self - Host of TV Show / Tall Man
- Senya Aozora
- Self - Host of TV Show / Short man
- Yuriko Hanabusa
- Shindo's mother
- Nakajirô Tomita
- General Hyodo
- Hideo Shibuya
- Journalist
- Haruo Nakajima
- Gojira
- Shôichi Hirose
- Kingugidora
- Masaki Shinohara
- Radon
- Katsumi Tezuka
- Mothra
- Kôji Uruki
- Radon
- Yoshio Katsube
- (as Yoshio Hattori)
- Keiichirô Katsumoto
- Villager
- Haruya Sakamoto
- King Ghidorah
- Seiji Ikeda
- Man in Crowd
- Mitsuo Tsuda
- Member of Parliament
- Shigeo Katô
- Tourist from Aso Mountain
- Akio Kusama
- Islander from Infant Island
- Hiroshi Akitsu
- Disc Club Member / Infant Islander / Minister
- Kazuo Hinata
- Princess Sarno's Entourge Member / Kotobukiyama Reporter / Ueno Park Reporter / Minister / Diet Audience Member
- Eisaburo Komatsu
- Village Police Officer / Disc Club Member / Ueno Park heckler
- Keiji Sakakida
- Reporter / Onlooker in Ueno Park / Evacuates in Yokohama
- Kôichi Satô
- Reporter / Yokohama Self-Defense Force Member
- Masaaki Tachibana
- Matsumoto Refugee / Coffee Shop Customer / Observation Deck Tourist
- Kamayuki Tsubono
- Sailor of the Kotobukiyama
- Sôji Ubukata
- Minister
