A series of murders in Michigan lead an American secret agent to Amsterdam, where he uncovers a plot to imperil the world with a potent new drug.
| Actor | Role |
|---|---|
 Ray DantonBryan Cooper / Superdragon | Bryan Cooper / Superdragon |
 Marisa MellCharity Farrel | Charity Farrel |
 Margaret LeeCynthia Fulton | Cynthia Fulton |
 Jess HahnBaby Face | Baby Face |
| CCarlo D'AngeloFernand Lamas | Fernand Lamas |
 Adriana AmbesiVerna | Verna |
 Marco GuglielmiProf. Kurge | Prof. Kurge |
| SSolvi StübingElizabeth | Elizabeth |
 Gérard HerterColeman (as Gerard Haerther) | Coleman (as Gerard Haerther) |
 Jacques HerlinRoss | Ross |
 Carlo HintermannColeman | Coleman |
 Pinkas Braun(uncredited) | (uncredited) |
| CChristia Hester(uncredited) | (uncredited) |
 Benito StefanelliKirk | Kirk |
 Artemio AntoniniVan Opel Henchman (uncredited) | Van Opel Henchman (uncredited) |
 Angelo CasadeiGuard at auction | Guard at auction |
 Angelo Infanti(uncredited) | (uncredited) |
 Renato RomanoGym Director | Gym Director |
 Nello PazzafiniCharity's Bodyguard (uncredited) | Charity's Bodyguard (uncredited) |