A secret agent possesses a ring that makes him invisible for a short time, once every 10 hours. He is in pursuit of an evil criminal mastermind but, at the same time, must evade an enemy agent who also wants the ring.
| Actor | Role |
|---|---|
 Patrick O'NealPerry 'Matchless' Liston | Perry 'Matchless' Liston |
 Ira von FürstenbergArabella | Arabella |
 Donald PleasenceGregori Andreanu | Gregori Andreanu |
 Henry SilvaHank Norris | Hank Norris |
 Nicoletta MachiavelliTipsy | Tipsy |
 Howard St. JohnGeneral Shapiro | General Shapiro |
 Sorrell BookeColonel Coolpepper | Colonel Coolpepper |
| TTiziano CortiniHogdon (as Lewis Jordan) | Hogdon (as Lewis Jordan) |
 Elisabetta WuO-Lan (as Elisabeth Wu) | O-Lan (as Elisabeth Wu) |
 Eddra GaleNot listed | Not listed |
 Ennio AntonelliNot listed | Not listed |
 Geoffrey CoplestonNot listed | Not listed |
| GGianluigi CrescenziNot listed | Not listed |
 Alfredo MartinelliNot listed | Not listed |
 Massimo CiprariNot listed | Not listed |
 Valéry InkijinoffNot listed | Not listed |