Directed by
| Peter Collinson | ||
Writing Credits
| Harry Alan Towers | ... | (screenplay) (as Peter Welbeck) |
| Agatha Christie | ... | (novel) (uncredited) |
| Erich Kröhnke | ||
| Enrique Llovet | ||
Cast (in credits order) complete, awaiting verification
| Oliver Reed | ... | Hugh Lombard | |
| Elke Sommer | ... | Vera Clyde | |
| Richard Attenborough | ... | Judge Cannon | |
| Stéphane Audran | ... | Ilona (as Stephane Audran) | |
| Gert Fröbe | ... | Blore (as Gert Froebe) | |
| Herbert Lom | ... | Dr. Armstrong | |
| Maria Rohm | ... | Elsa Martino | |
| Adolfo Celi | ... | The General | |
| Alberto de Mendoza | ... | Martino | |
| Charles Aznavour | ... | Raven | |
| Orson Welles | ... | U. N. Owen / and the voice of (voice) | |
| Teresa Gimpera | ... | Maria (credit only) | |
| Rik Battaglia | ... | Vendedor (as Rick Battaglia) (credit only) | |
| Rest of cast listed alphabetically: | |||
 |
Nasrin Kahzak | ... | Trapisondista (uncredited) |
| Naser Malek Motiee | ... | Inspector (uncredited) | |
Produced by
| Harry Benn | ... | associate producer |
| Alain Dahan | ... | producer |
| Juan Estelrich | ... | associate producer |
| Alexander Grüter | ... | executive producer |
| Ennio Nobili | ... | co-producer (uncredited) |
| Tíbor Reves | ... | associate producer |
| Harry Alan Towers | ... | producer |
Music by
| Bruno Nicolai | ... | (international version) |
| Carlo Rustichelli | ... | (uncredited) |
Cinematography by
| Fernando Arribas | ... | director of photography |
Editing by
| Gabrielle Reinecke | ... | (German version) |
| John Trumper | ||
Production Design by
| José María Tapiador | ||
Makeup Department
| Louis Bonnemaison | ... | makeup artist |
| Ana Criado | ... | hair stylist |
| Cristóbal Criado | ... | makeup artist |
| Luis Criado | ... | assistant makeup artist |
Production Management
| Juan Estelrich | ... | production manager |
| Nicholas Wentworth | ... | post-production supervisor |
Second Unit Director or Assistant Director
| José López Rodero | ... | assistant director |
| Stefano Sbarigia | ... | assistant director |
Sound Department
| Mike Le Mare | ... | sound editor |
| Peter Offer | ... | sound assistant |
| Trevor Pyke | ... | rerecording |
| Wilhelm Schmidke | ... | sound |
| Ivan Sharrock | ... | sound mixer |
Special Effects by
| Emilio Ruiz del Río | ... | special effects |
Camera and Electrical Department
| Julio Leyva | ... | lighting technician |
| Mario Mazzoni | ... | still photographer |
| Eduardo Noé | ... | camera operator |
| Javier Pérez Zofio | ... | second unit: camera operator assistant (as Javier P. Zofio) |
| Ramón F. Suárez | ... | director of photography: second unit |
Editorial Department
| Michael Crowley | ... | assistant editor (as Mike Crowley) |
| María Luisa Pino | ... | second assistant editor |
Music Department
| Bruno Nicolai | ... | conductor |
Script and Continuity Department
| Susanna Merry | ... | continuity (as Sue Merry) |
Additional Crew
| Charles Athey | ... | production accountant |
| Ángel Sevillano | ... | production assistant |
| Robert Rietty | ... | voice dubbing: Gert Fröbe/Adolfo Celi/Alberto de Mendoza- US version (uncredited) |
