 Yōsuke NatsukiDetective Shindo | Detective Shindo |
 Yuriko HoshiNaoko Shindo | Naoko Shindo |
 Hiroshi KoizumiProfessor Murai | Professor Murai |
 Takashi ShimuraDr. Tsukamoto | Dr. Tsukamoto |
 Emi ItoShobijin | Shobijin |
 Yumi ItoShobijin | Shobijin |
 Akiko WakabayashiPrincess Maas Doulina Salno of Selgina | Princess Maas Doulina Salno of Selgina |
 Hisaya ItoChief Assassin Malmess | Chief Assassin Malmess |
 Akihiko HirataChief Detective Okita | Chief Detective Okita |
 Minoru TakadaPrime Minister | Prime Minister |
| SSomeshō MatsumotoAlien Expert | Alien Expert |
 Ikio SawamuraHonest Fisherman | Honest Fisherman |
 Kōzō NomuraGeologist | Geologist |
 Kenji SaharaEditor in Chief Kanamaki | Editor in Chief Kanamaki |
 Susumu KurobeAssassin with Mustache (uncredited) | Assassin with Mustache (uncredited) |
 Tōru IbukiShort-Tie Assassin | Short-Tie Assassin |
 Kazuo SuzukiDoor-Opener Assassin | Door-Opener Assassin |
| HHaruya KatōJournalist | Journalist |
 Shin ŌtomoBoss of Assassins | Boss of Assassins |
 Senkichi ŌmuraWould-Be Hat Retriever | Would-Be Hat Retriever |
 Yutaka NakayamaTourist with Lost Hat | Tourist with Lost Hat |
 Heihachirō ŌkawaAstronomer | Astronomer |
 Hideyo AmamotoPrincess Salno's aide | Princess Salno's aide |
 Yoshio KosugiChief of Infant Island | Chief of Infant Island |
 Yoshibumi TajimaShip Captain | Ship Captain |
| YYutaka OkaMeteoritic (uncredited) | Meteoritic (uncredited) |
| KKôji UnoHotel Clerk (uncredited) | Hotel Clerk (uncredited) |
| SShigeki IshidaMan in Crowd (uncredited) | Man in Crowd (uncredited) |
| TToshihiko FurutaVillager (uncredited) | Villager (uncredited) |
 Kotaro TomitaVillager | Villager |
