 Hiroshi KoizumiTsukioka | Tsukioka |
 Setsuko WakayamaHidemi | Hidemi |
 Minoru ChiakiKobayashi (as Mindru Chiaki) | Kobayashi (as Mindru Chiaki) |
 Takashi ShimuraDr. Yamane | Dr. Yamane |
 Masao ShimizuDr. Tadokoro | Dr. Tadokoro |
 Seijirô OndaCommander (as Serjiro Onda) | Commander (as Serjiro Onda) |
 Sonosuke SawamuraShibeki | Shibeki |
 Yoshio TsuchiyaTajima | Tajima |
 Mayuri MokushôRadio Operator | Radio Operator |
| YYukio KasamaFather (as Yokio Kasama) | Father (as Yokio Kasama) |
| TTakeo OikawaPolice Chief | Police Chief |
 Minosuke YamadaChief of Civil Defense (uncredited) | Chief of Civil Defense (uncredited) |
 Ren YamamotoIkeda (uncredited) | Ikeda (uncredited) |
 Shin ŌtomoConvict Leader (uncredited) | Convict Leader (uncredited) |
 Senkichi ŌmuraConvict (uncredited) | Convict (uncredited) |
 Haruo NakajimaGigantis (uncredited) | Gigantis (uncredited) |
 Katsumi TezukaAngurus (uncredited) | Angurus (uncredited) |
 Shōichi HiroseConvict (uncredited) | Convict (uncredited) |
 Keye LukeTsukioka / Policeman (voice) (uncredited) | Tsukioka / Policeman (voice) (uncredited) |
| AAya OyamaHidemi (voice) (uncredited) | Hidemi (voice) (uncredited) |
 Marvin MillerKobayashi / Dr. Yamane / Narrator (voice) (uncredited) | Kobayashi / Dr. Yamane / Narrator (voice) (uncredited) |
 Paul FreesCommander / Father / Convict (voice) (uncredited) | Commander / Father / Convict (voice) (uncredited) |
 George TakeiIkeda / Osaka SDF Dispatcher (voice) (uncredited) | Ikeda / Osaka SDF Dispatcher (voice) (uncredited) |
| JJane ChangRadio Operator (voice) (uncredited) | Radio Operator (voice) (uncredited) |
 James YagiOsaka SDF Captain (voice) (uncredited) | Osaka SDF Captain (voice) (uncredited) |
