| Person | Type | Job | Role(s) |
|---|---|---|---|
 Anthony Kimmins | Crew | Directing | Director, Producer |
 Benjamin Frankel | Crew | Sound | Original Music Composer |
Cliff Richardson | Crew | Visual Effects | Special Effects Supervisor |
 Freddie Francis | Crew | Camera | Camera Operator |
Jack Kitchin | Crew | Production | Producer |
John O'Gorman | Crew | Costume & Make-Up | Makeup Artist |
Nigel Balchin | Crew | Writing | Novel, Screenplay |
Richard Best | Crew | Editing | Editor |
Wilkie Cooper | Crew | Camera | Director of Photography |
William C. Andrews | Crew | Art | Art Direction |
Anne Head | Crew | Art | Set Decoration |
Alan Haines | Crew | Costume & Make-Up | Costume Design |
Alan Allen | Crew | Crew | Sound Recordist |
Eileen Bates | Crew | Costume & Make-Up | Hairstylist |
 Barbara White | Cast | Actress | Molly Sinclair Lucian |
 Burgess Meredith | Cast | Actor | Felix Milne |
 Clive Morton | Cast | Actor | Robert Paston |
 Dulcie Gray | Cast | Actress | Patricia Milne |
Edgar Norfolk | Cast | Actor | Sir George Freethorne |
 Geoffrey Sumner | Cast | Actor | Parkinson |
Gwynne Whitby | Cast | Actress | Miss English |
 Helen Haye | Cast | Actress | Lady Maresfield |
Jack Howarth | Cast | Actor | Party Guest |
 Jack Raine | Cast | Actor | Inspector Pierce |
 John Laurie | Cast | Actor | Dr. James Garsten |
 John Stuart | Cast | Actor | Dr. John Hayling |
 Joss Ambler | Cast | Actor | Julian Briant |
 Kieron Moore | Cast | Actor | Adam Lucian |
 Laurence Hanray | Cast | Actor | Dr. Lefage |
Malcolm Dalmayne | Cast | Charlie Oakes | |
 Martin Miller | Cast | Actor | Dr. Hans Tautz |
 Michael Hordern | Cast | Actor | Co-Counsel at Inquest |
 Michael Shepley | Cast | Actor | Peter Edge |
Ronald Simpson | Cast | Actor | Mr. Grandison |
 Walter Fitzgerald | Cast | Actor | Dr. Norris Pile |
 Christine Norden | Cast | Actress | Barbara 'Babs' Edge |
| Person | Type | Job | Role(s) |
