| Person | Type | Job | Role(s) |
|---|---|---|---|
 Agatha Christie | Crew | Writing | Novel |
 Alain Dahan | Crew | Production | Producer |
 Bruno Nicolai | Crew | Sound | Original Music Composer, Conductor |
 Carlo Rustichelli | Crew | Sound | Original Music Composer |
Cristóbal Criado | Crew | Costume & Make-Up | Makeup Artist |
Eduardo Noé | Crew | Camera | Camera Operator |
Emilio Ruiz del Río | Crew | Crew | Special Effects |
Enrique Llovet | Crew | Writing | Writer |
Erich Kröhnke | Crew | Writing | Writer |
Fernando Arribas | Crew | Camera | Director of Photography |
 Harry Alan Towers | Crew | Production | Producer, Writer |
Harry Benn | Crew | Production | Associate Producer |
Ivan Sharrock | Crew | Sound | Sound Mixer |
Javier Pérez Zofio | Crew | Camera | Assistant Camera |
John Trumper | Crew | Editing | Editor |
 José López Rodero | Crew | Directing | Assistant Director |
José María Tapiador | Crew | Art | Production Design |
Mike Le Mare | Crew | Sound | Sound Editor |
Nicholas Wentworth | Crew | Crew | Post Production Supervisor |
 Peter Collinson | Crew | Directing | Director |
Ramón F. Suárez | Crew | Camera | Additional Director of Photography |
Tíbor Reves | Crew | Production | Associate Producer |
Gabrielle Reinecke | Crew | Editing | Editor |
Wilhelm Schmidke | Crew | Sound | Sound |
Louis Bonnemaison | Crew | Costume & Make-Up | Makeup Artist |
Ana Criado | Crew | Costume & Make-Up | Hairstylist |
Charles Athey | Crew | Production | Production Accountant |
Trevor Pyke | Crew | Sound | Sound Re-Recording Mixer |
Luis Criado | Crew | Costume & Make-Up | Assistant Makeup Artist |
Alexander Grüter | Crew | Production | Executive Producer |
María Luisa Pino | Crew | Editing | Assistant Editor |
Julio Leyva | Crew | Lighting | Lighting Technician |
Mario Mazzoni | Crew | Camera | Still Photographer |
Michael Crowley | Crew | Editing | Assistant Editor |
Susanna Merry | Crew | Directing | Continuity |
Ennio Nobili | Crew | Production | Co-Producer |
Ángel Sevillano | Crew | Production | Production Assistant |
Stefano Sbarigia | Crew | Directing | Assistant Director |
Peter Offer | Crew | Sound | Sound Assistant |
Juan Estelrich | Crew | Production | Associate Producer, Production Manager |
 Adolfo Celi | Cast | Actor | General André Salvé |
 Alberto de Mendoza | Cast | Actor | Otto Martino |
 Charles Aznavour | Cast | Actor | Michel Raven |
 Elke Sommer | Cast | Actress | Vera Clyde |
 Gert Fröbe | Cast | Actor | Wilhelm Blore |
 Herbert Lom | Cast | Actor | Dr. Edward Armstrong |
 Maria Rohm | Cast | Actress | Elsa Martino |
 Naser Malek Motiee | Cast | Actor | Inspector |
 Oliver Reed | Cast | Actor | Hugh Lombard |
 Orson Welles | Cast | Actor | Voice on Tape |
 Richard Attenborough | Cast | Actor | Judge Arthur Cannon |
 Rik Battaglia | Cast | Actor | Rick Battaglia/Vendedor |
 Stéphane Audran | Cast | Actress | Ilona Morgan |
 Teresa Gimpera | Cast | Actress | Maria |
 Sepideh | Cast | Inspector's Girlfriend | |
| Person | Type | Job | Role(s) |
