Police try to track down a hooded serial killer who murders his victims with a combination of acid and poison gas.
| Actor | Role |
|---|---|
 Joachim FuchsbergerInspektor Higgins | Inspektor Higgins |
 Uschi GlasAnn Portland | Ann Portland |
 Grit BoettcherBetty Falks | Betty Falks |
 Siegfried SchürenbergSir John | Sir John |
 Konrad GeorgKeyston | Keyston |
 Harry RiebauerMark Denver | Mark Denver |
 Tilly LauensteinHarriet Foster | Harriet Foster |
 Ilse PagéSecretary | Secretary |
 Siegfried RauchFrank Keeney | Frank Keeney |
 Claus HolmGlenn Powers | Glenn Powers |
 Günter MeisnerGreaves | Greaves |
| HHans EpskampBannister | Bannister |
 Heinz SpitznerHarrison | Harrison |
 Jan HendriksBrent | Brent |
 Rudolf SchündlerSergeant Hanfield | Sergeant Hanfield |
| NNarziß SokatscheffCress Bartling | Cress Bartling |
 Tilo von BerlepschDr. Shinewood | Dr. Shinewood |
| KKurt WaitzmannCarrington | Carrington |
 Suzanne RoquetteMary Houston | Mary Houston |
 Susanne JuhnkeJune Bell | June Bell |
| IInge SieversMildred Miller | Mildred Miller |
 Ewa StrömbergPam Walsbury | Pam Walsbury |
 Bruno W. PantelBusschaffner | Busschaffner |
| KKurt BuechelerWinston Robson | Winston Robson |
| WWilhelm VorwergDr. Cabble | Dr. Cabble |