 | John Mills als Dr. Howard Latimer |
 | Derek Farr als Kenneth Palmer |
 | Noelle Middleton als Laura James |
 | Wilfrid Hyde-White als Maj. Harrington aka Robert Brady |
 | Roland Culver als Detective Inspector Dane |
 | Mervyn Johns als Dr. George Kimber |
 | Rène Ray als Mrs. Ambler |
 | Lionel Jeffries als Geoffrey Windsor |
 | Lisa Daniely als Frieda Veldon |
 | David Williams als The Detective Sergeant |
| Diana Lambert als Latimer's Office Nurse |
| Hal Osmond als Joe - Golf Caddy |
| Gillian Moran |
| Gerald Thomas | Director |
| Stanley Black | Original Music Composer |
| Peter Boita | Editor |
| Eric Saw | Draughtsman |
| Peter Rogers | Producer |
| Francis Durbridge | Screenplay |
| Jack Stevens | Art Direction |
| Basil Keys | Production Manager |
| Otto Heller | Director of Photography |
| Alan Hume | Camera Operator |
| William Hill | Assistant Director |
| Len Page | Sound Recordist |
| Richard Marden | Sound Editor |
| Rita Davison | Continuity |
| Jill Carpenter | Makeup Artist |
| Marjorie Whittle | Hairdresser |
| Vi Murray | Wardrobe Designer |
