Directed by
| Michele Lupo | ||
Writing Credits
| Roberto Leoni | ... | (screenplay) & |
| Roberto Leoni | ... | (story) |
| Franco Bucceri | ... | (story) |
| Nico Ducci | ... | (screenplay) |
| Michele Lupo | ... | (screenplay) |
| Mino Roli | ... | (screenplay) |
Cast (in credits order)
| Kirk Douglas | ... | Steve Wallace | |
| Giuliano Gemma | ... | Marco | |
| Florinda Bolkan | ... | Anna | |
| Wolfgang Preiss | ... | Miller | |
| Reinhard Kolldehoff | ... | Detective Hoffman (as Rene Kolldehoff) | |
| Romano Puppo | ... | Miller's Lieutenant | |
| Bruno Corazzari | ... | Eric | |
| John Bartha | ... | Murdered Security Guard | |
 |
Allen Stanley | ||
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Vittorio Fanfoni | ||
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Luigi Antonio Guerra | ||
| Rest of cast listed alphabetically: | |||
| Herbert A.E. Böhme | ... | Captain Hansmunsen | |
| Peter Kuiper | ... | Gustav | |
| Paul Muller | ... | (scenes deleted) | |
| Lionel Vitrant | ... | chauffeur Citroen (uncredited) | |
Produced by
| Manolo Bolognini | ... | executive producer |
| Marina Cicogna | ... | producer |
Music by
| Ennio Morricone | ||
Cinematography by
| Tonino Delli Colli | ... | (as Tonino delli Colli) |
Editing by
| Antonietta Zita | ... | (as Tony Zita) |
Art Direction by
| Francesco Bronzi | ||
Costume Design by
| Enrico Sabbatini | ||
Makeup Department
| Maria Teresa Corridoni | ... | key hair stylist |
Production Management
| Micheal Burns | ... | production manager |
| Roberto Cocco | ... | production manager |
| Brennon Jones | ... | production manager |
Second Unit Director or Assistant Director
| Gianni Arduini | ... | assistant director |
Sound Department
| Italo Cameracanna | ... | foley artist / sound effects editor |
| James Nelson | ... | supervising sound editor (uncredited) |
Special Effects by
| Dario Micheli | ... | special effects |
Stunts
| Rémy Julienne | ... | stunts |
| Nazzareno Zamperla | ... | stunt coordinator |
Camera and Electrical Department
| Giovanni Ciarlo | ... | camera operator |
| Augusto Diamanti | ... | key grip |
| Alberto Ridolfi | ... | chief electrician |
| Carlo Tafani | ... | assistant camera |
Costume and Wardrobe Department
| Giovanni Viti | ... | assistant costume designer |
Music Department
| Nicola Samale | ... | conductor |
Additional Crew
| Nguyen Ai Quoc | ... | translator |
| Charles C. Fox | ... | consultant: Vietnam |
| Barbara Gore | ... | translator |
| Tran Hung Dao | ... | translator |
| Le Thai To | ... | translator |
| Le Thanh Tong | ... | translator |
| Trung Trac | ... | translator |
| Beate Hasenau | ... | voice dubbing: Florinda Bolkan (german version) (uncredited) |
| Pino Locchi | ... | voice dubbing: Giuliano Gemma (uncredited) |
| Giuseppe Rinaldi | ... | voice dubbing: Kirk Douglas (uncredited) |
| Rita Savagnone | ... | voice dubbing: Florinda Bolkan (uncredited) |
