 | John Bentley als Superintendent Wills |
 | Patrick Allen als Dr. Nelson Pollard |
 | Jacqueline Ellis als Elsa Marlowe |
 | Wilfrid Brambell als Lock-Keeper |
 | John Glyn-Jones als Dr. Maurice Tarn |
| Jane Murdoch als Honeymoon Wife |
| Clive Donner | Director |
| Derek Holding | Editor |
| Robert Banks Stewart | Writer |
| Bert Mason | Cinematography |
| Charles Blackwell | Original Music Composer |
| Peter Mullins | Art Direction |
| Edgar Wallace | Novel |
| Jack Greenwood | Producer |
| Jim O'Connolly | Associate Producer |
