| Person | Type | Job | Role(s) |
|---|---|---|---|
 Eric Rogers | Crew | Sound | Original Music Composer |
John Kruse | Crew | Writing | Screenplay |
Kendal Young | Crew | Writing | Novel |
 Sidney Hayers | Crew | Directing | Director |
 Peter Rogers | Crew | Production | Producer |
Courtenay Elliott | Crew | Costume & Make-Up | Costume Design |
 Allan Cuthbertson | Cast | Actor | Coroner |
 Anthony Ainley | Cast | Actor | Mr. Bartell |
Charles Rayford | Cast | Actor | Dead Chemist (uncredited) |
 David Essex | Cast | Actor | Man in Chemist Shop |
 Dilys Hamlett | Cast | Actress | Mrs. Sanford |
 Frank Finlay | Cast | Actor | Det. Chief Supt. Velyan |
 Freddie Jones | Cast | Actor | Reporter |
 James Cosmo | Cast | Actor | Det. Sgt. Beale |
 James Laurenson | Cast | Actor | Greg Lomax |
Janet Lynn | Cast | Girl in Library | |
 John Stone | Cast | Actor | Fire Chief |
 John Swindells | Cast | Actor | Desk Sergeant |
Kit Taylor | Cast | Actor | Doctor |
 Lesley-Anne Down | Cast | Actress | Tessa Hurst |
 Marianne Stone | Cast | Actress | Matron |
 Pat Gorman | Cast | Actor | Final scene pc (uncredited) |
 Patrick Jordan | Cast | Actor | Sgt. Milton |
 Suzy Kendall | Cast | Actress | Julie West |
Tom Chatto | Cast | Actor | Police Doctor |
 Tony Beckley | Cast | Actor | Leslie Sanford |
 William Hoyland | Cast | Actor | Chemist in Hospital |
 Renu Setna | Cast | Actor | Doctor (uncredited) |
Joe Wadham | Cast | Actor | Police Driver (uncredited) |
Reg Thomason | Cast | Actor | Man in Police Station (uncredited) |
Jill Carey | Cast | Night Receptionist | |
Valerie Shute | Cast | Actress | Girl in Chemist Shop |
Siobhan Quinlan | Cast | Actress | Jenny Greenaway |
Anabel Littledale | Cast | Actress | Susan Miller |
Jan Butlin | Cast | Day Receptionist | |
Patricia Driscoll | Cast | Mrs. Hurst (uncredited) | |
| Person | Type | Job | Role(s) |
