 | Shelley Winters als Mrs. Forrest |
 | Mark Lester als Christopher Coombs |
 | Chloe Franks als Katy Coombs |
 | Ralph Richardson als Mr. Benton |
 | Lionel Jeffries als Police Insp. Willoughby |
 | Hugh Griffith als Mr. Harrison, The Pigman |
 | Rosalie Crutchley als Miss Henley |
 | Pat Heywood als Dr. Mason |
 | Judy Cornwell als Clarine |
 | Michael Gothard als Albie |
 | Jackie Cowper als Angela Barnes |
| Richard Beaumont als Peter Brookshire |
 | Marianne Stone als Miss Wilcox |
 | Dorian Healy als Reggie Pike (uncredited) |
| Sally Nicholl | Casting |
| David D. Osborn | Original Story |
| Eddie Knight | Makeup Artist |
| Desmond Dickinson | Director of Photography |
| Bridget Sellers | Wardrobe Supervisor |
| Jimmy Sangster | Screenplay |
| Jimmy Sangster | Producer |
| Samuel Z. Arkoff | Producer |
| Kenneth V. Jones | Original Music Composer |
| Kenneth V. Jones | Conductor |
| George Provis | Art Direction |
| Tristam Cones | Editor |
| Curtis Harrington | Director |
| Robert Blees | Screenplay |
| Gavin Lambert | Additional Dialogue |
| James H. Nicholson | Producer |
| James H. Nicholson | Executive Producer |
| Louis M. Heyward | Executive Producer |
| Norman Jones | Camera Operator |
| Colin M. Brewer | Assistant Director |
| John Pellatt | Associate Producer |
| June Randall | Continuity |
| Joyce James | Hairdresser |
| Peter Lennard | Sound Editor |
| Sylvia Croft | Makeup Artist |
| Ken Ritchie | Sound Recordist |
| Donald Toms | Production Manager |
| Pat McDermott | Hairdresser |
| Dennison Thornton | Publicist |
| Richard Langford | Sound Recordist |
