The Three Fantastic Supermen travel to Tokyo in search of a stolen miniaturization ray which they end up testing upon themselves.
| Actor | Role |
|---|---|
 George MartinTeniente Martin | Teniente Martin |
 Sal BorgeseDick | Dick |
 Willi ColombiniWilly | Willy |
 Gloria PaulGloria | Gloria |
 Elisabetta WuYamita | Yamita |
 Mino DoroJacob Ferré | Jacob Ferré |
| MMichele MalaspinaAgente Interpol | Agente Interpol |
 Edoardo TonioloWalter Spedowski | Walter Spedowski |
 Heidi FischerJanet | Janet |
 Attilio SeveriniCapo dei criminali | Capo dei criminali |
 Paul MüllerNot listed | Not listed |
 Consalvo Dell'ArtiNot listed | Not listed |
| VValerio TordiNot listed | Not listed |
| AAntonio CoreviNot listed | Not listed |
| TTsao Hong TcheNot listed | Not listed |
| CClaudio PatriarcaNot listed | Not listed |
 Artemio AntoniniNot listed | Not listed |
| AAntonietta FioritoNot listed | Not listed |
| AArrigo PeriNot listed | Not listed |