 Kenji SaharaShigeru Kawamura | Shigeru Kawamura |
 Yumi ShirakawaKiyo | Kiyo |
 Akihiko HirataProfessor Kyuichiro Kashiwagi | Professor Kyuichiro Kashiwagi |
 Minosuke YamadaMining Chief Osaki | Mining Chief Osaki |
 Yoshibumi TajimaIzeki | Izeki |
| AAkio KoboriPolice Chief Nishimura | Police Chief Nishimura |
| MMitsuo TsudaStaff Officer Takeuchi | Staff Officer Takeuchi |
| RRen ImaizumiSunagawa | Sunagawa |
| JJun'ichirō MukaiMilitary officer | Military officer |
 Rinsaku OgataGoro | Goro |
| IIchirō ChibaChief of Police | Chief of Police |
| TTsurue IchimanjiHaru | Haru |
| TTateo KawasakiTsunesan | Tsunesan |
| KKanta KisaragiSuteyan | Suteyan |
 Tsuruko ManoOsumi | Osumi |
| JJirô SuzukawaYoshizo | Yoshizo |
| YYasuhiro ShigenobuSabu | Sabu |
 Keiji SakakidaTahei | Tahei |
 Ichirō NakataniSenkichi | Senkichi |
| KKiyoshi TakagiDr. Minakami (uncredited) | Dr. Minakami (uncredited) |
 Fuyuki MurakamiProfessor Minami (uncredited) | Professor Minami (uncredited) |
| MMitsuo MatsumotoProfessor Isokawa (uncredited) | Professor Isokawa (uncredited) |
 Takuzō KumagaiPoliceman Tashiro (uncredited) | Policeman Tashiro (uncredited) |
 Yasuhisa TsutsumiImamura, F-86F pilot (uncredited) | Imamura, F-86F pilot (uncredited) |
| YYutaka OkaKitahara, F-86F pilot (uncredited) | Kitahara, F-86F pilot (uncredited) |
| SShigemi SunagawaF-86F pilot (uncredited) | F-86F pilot (uncredited) |
 Katsumi TezukaRodan / Meganulon / Hotel Manager | Rodan / Meganulon / Hotel Manager |
 Haruo NakajimaRodan / Meganulon | Rodan / Meganulon |
 Shōichi HiroseMeganulon / Fighter pilot | Meganulon / Fighter pilot |
| SSaburô KadowakiSunagawa's colleague (uncredited) | Sunagawa's colleague (uncredited) |
