| Person | Type | Job | Role(s) |
|---|---|---|---|
 Douglas Slocombe | Crew | Camera | Director of Photography |
 Franz Reizenstein | Crew | Sound | Original Music Composer |
George Baxt | Crew | Writing | Screenplay |
Jack Shampan | Crew | Art | Art Direction |
Julian Wintle | Crew | Production | Producer |
Leslie Parkyn | Crew | Production | Producer |
Lionel Selwyn | Crew | Sound | Sound Editor |
Maude Onslow | Crew | Costume & Make-Up | Hairstylist |
Muir Mathieson | Crew | Sound | Original Music Composer |
Norman Priggen | Crew | Production | Associate Producer |
Reginald Mills | Crew | Editing | Editor |
 Samuel Z. Arkoff | Crew | Production | Producer |
 Sidney Hayers | Crew | Directing | Director, Editor |
Trevor Crole-Rees | Crew | Costume & Make-Up | Makeup Artist |
Len Page | Crew | Sound | Sound Recordist |
Ken Cameron | Crew | Sound | Sound Recordist |
Charles Permane | Crew | Production | Production Manager |
Harry Ledger | Crew | Editing | Assistant Editor |
Vi Murray | Crew | Costume & Make-Up | Wardrobe Master |
Morris Angel | Crew | Costume & Make-Up | Costume Design |
 Anton Diffring | Cast | Actor | Dr. Schuler |
Carla Challoner | Cast | Nicole (as a Child) | |
Colette Wilde | Cast | Actress | Evelyn Morley |
 Conrad Phillips | Cast | Actor | Inspector Arthur Ames |
 Donald Pleasence | Cast | Actor | Vanet |
 Erika Remberg | Cast | Actress | Elissa Caro |
 Glyn Houston | Cast | Actor | Carnival Barker (uncredited) |
 Jack Gwillim | Cast | Actor | Supt. Andrews |
 Jane Hylton | Cast | Actress | Angela |
 Kenneth Griffith | Cast | Actor | Martin |
 Kenneth J. Warren | Cast | Actor | First Roustabout |
 Kenny Baker | Cast | Actor | Dwarf |
 Vanda Hudson | Cast | Actress | Magda von Meck |
 Walter Gotell | Cast | Actor | Baron Von Gruber |
 William Mervyn | Cast | Actor | Dr. Morley |
 Yvonne Monlaur | Cast | Actress | Nicole Vanet |
 Yvonne Romain | Cast | Actress | Melina |
Jack Carson | Cast | Chief Eagle Eye | |
 Peter Swanwick | Cast | Actor | Inspector Knopf |
Reg Thomason | Cast | Actor | Roustabout (uncredited) |
Arthur Dibbs | Cast | Circus Audience Member (uncredited) | |
| Person | Type | Job | Role(s) |
