 Florinda BolkanCarol Hammond | Carol Hammond |
 Stanley BakerInspector Corvin | Inspector Corvin |
 Jean SorelFrank Hammond | Frank Hammond |
 Silvia MontiDeborah | Deborah |
 Alberto de MendozaSergeant Brandon | Sergeant Brandon |
 Penny BrownJenny | Jenny |
 Mike KennedyHubert | Hubert |
 Ely GalleaniJoan Hammond | Joan Hammond |
| GGeorge RigaudDr. Kerr | Dr. Kerr |
| EEzio MaranoLowell - Scientific Squad | Lowell - Scientific Squad |
 Franco BalducciMcKenna | McKenna |
 Luigi Antonio GuerraPoliceman | Policeman |
 Erzsi PaálMrs. Gordon | Mrs. Gordon |
| GGaetano ImbróPoliceman | Policeman |
 Leo GennEdmond Brighton | Edmond Brighton |
 Anita StrindbergJulia Durer (uncredited) | Julia Durer (uncredited) |
 Tony AdamsPoliceman (uncredited) | Policeman (uncredited) |
 Jean DegraveSt. Paul's Clinic Director (uncredited) | St. Paul's Clinic Director (uncredited) |
 Basil DignamCommissioner McCloud (uncredited) | Commissioner McCloud (uncredited) |
| UUrsel EberzPolicewoman Beth (uncredited) | Policewoman Beth (uncredited) |
| PPiero NistriMrs. Gordon's Chauffeur (uncredited) | Mrs. Gordon's Chauffeur (uncredited) |
| FFred WoodTrain passenger | Train passenger |
| JJohn CliffordTrain Passenger (uncredited) | Train Passenger (uncredited) |
| LLew HooperPoliceman (uncredited) | Policeman (uncredited) |
| GGeorge SpenceTrain Passenger (uncredited) | Train Passenger (uncredited) |
| RRita Tobin-WeskeTrain Passenger (uncredited) | Train Passenger (uncredited) |
| JJack ArmstrongNot listed | Not listed |
| FFred WoodNot listed | Not listed |
