Directed by
| Gianfranco Baldanello | ||
Writing Credits (in alphabetical order)
| John Fonseca | ... | (screenplay) |
| Elliot Geisinger | ... | (screenplay) |
| Juan Logar | ||
| Jack London | ... | (novel) |
| Jesús Rodríguez | ||
| Egerton Ryerson Young | ... | (source material) |
Cast (in credits order)
| Jack Palance | ... | William Bates | |
| Joan Collins | ... | Sonia Kendall | |
 |
Elisabetta Virgili | ... | Mary Chambers (as Elizabeth Virgil) |
| Manuel de Blas | ... | John McKenzie | |
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Fernando E. Romero | ... | Jim Chambers (as Fred Romer) |
| Remo De Angelis | ... | Hank McKenzie | |
| Ricardo Palacios | ... | Charlie - Barkeeper | |
| Attilio Dottesio | ... | Jim and Mary's father | |
| José Canalejas | ... | Bates Henchman | |
|
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Enzo De Toma | ... | Buzz - Raftsman |
|
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Achille Grioni | ... | Bates henchman |
|
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Filippo La Neve | ... | Tom Jarrell - Lawyer |
|
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Boris Zanardi | ||
|
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Emilio Mellado | ... | Fatso - Bank robber |
| Rest of cast listed alphabetically: | |||
|
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Mario De Barros | ... | Bates henchman |
|
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Renato Izzo | ... | Narrator (uncredited) |
Produced by
| Joseph Allegro | ... | producer |
| Elliot Geisinger | ... | producer |
| Alexander Hacohen | ... | executive producer |
| Harry Alan Towers | ... | co-producer (uncredited) |
Music by
| Stelvio Cipriani | ||
Cinematography by
| José F. Aguayo hijo | ||
Editing by
| Francesco Bertuccioli | ||
Production Design by
| Horacio Rodríguez | ||
Makeup Department
| Olga Bonaccorsi | ... | makeup artist |
Production Management
| Lucio Como | ... | production secretary (as Luciano Comolli) |
| Giovanni Soldi | ... | production manager |
Second Unit Director or Assistant Director
| Juan Antonio Arévalo | ... | first assistant director |
Sound Department
| Amedeo Casati | ... | sound |
Stunts
| Remo De Angelis | ... | stunt coordinator |
Camera and Electrical Department
| Adolfo Cerea | ... | chief electrician |
| Onofrio Folli | ... | cinematographer: 2nd unit |
| Marco Rugiadini | ... | assistant camera |
| Enzo Tosi | ... | camera operator |
Costume and Wardrobe Department
| Adriana Manici | ... | seamstress |
Editorial Department
| Adalberto Ceccarelli | ... | assistant editor |
| Beppe Cino | ... | assistant editor (as Giuseppe Cino) |
Script and Continuity Department
| Margherita Reginato | ... | script supervisor |
Additional Crew
| Silvestro De Rossi | ... | administrator |
| Luciano De Ambrosis | ... | voice dubbing: Jack Palance (uncredited) |
| Manlio De Angelis | ... | voice dubbing: Manuel de Blas (uncredited) |
| Vittoria Febbi | ... | voice dubbing: Joan Collins (uncredited) |
| Antonio Guidi | ... | voice dubbing: Attilio Dottesio (uncredited) |
| Gianni Marzocchi | ... | voice dubbing: Remo De Angelis (uncredited) |
| Glauco Onorato | ... | voice dubbing: Ricardo Palacios (uncredited) |
| Giorgio Piazza | ... | voice dubbing (uncredited) |
