Directed by
| Mario Bava | ... | (as John Hold) |
| Leopoldo Savona | ... | (uncredited) |
Writing Credits
| Alberto Liberati | ... | (dialogue) |
| Gene Luotto | ... | (dialogue: English version) |
| Mario Bava | ... | (story and screenplay) (as John Hold) (credited on reissue prints) |
| Giorgio Simonelli | ... | (screenplay) (uncredited) |
| Giovanni Simonelli | ... | (screenplay) (uncredited) |
Cast (in credits order)
| Cameron Mitchell | ... | Ator / Rurik / Helmut | |
| Fausto Tozzi | ... | Hagen (as Frank Ross) | |
| Giacomo Rossi Stuart | ... | King Arald (as Jack Rossi Stuart) | |
 |
Luciano Pollentin | ... | Moki (as Louis Polletin) |
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Amedeo Trilli | ... | Viking King (as Michael Moore) |
| Renato Terra | ... | Hagen's Henchman (as Rodney Terra) | |
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Sergio Cortona | ... | Hagen's Henchman (as Sidney Cortèz) |
|
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Elissa Pichelli | ... | Karin (as Lisa Wagner) |
| Rest of cast listed alphabetically: | |||
|
|
Bruno Ariè | ... | Hut Intruder (uncredited) |
|
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Osiride Pevarello | ... | Hagen's Henchman (uncredited) |
| Goffredo Unger | ... | Hagen's Henchman (uncredited) | |
Produced by
| Saro Patanè | ... | executive producer (uncredited) |
| Pasquale Tagliaferri | ... | producer (as P. Tagliaferri) |
Music by
| Marcello Giombini | ||
Cinematography by
| Antonio Rinaldi | ... | director of photography (as Anthony Rinaldi) (as Antony Rinaldi: reissue prints) |
| Mario Bava | ... | (uncredited) |
Editing by
| Otello Colangeli | ... | (as Othello) |
Production Design by
| Massimo Tavazzi | ... | (uncredited) |
Art Direction by
| Piero Filippone | ... | (as Peter Felt) |
Set Decoration by
| Massimo Tavazzi | ||
Costume Design by
| Giorgio Desideri | ... | (as George Desideri) |
Makeup Department
| Ines Albi | ... | hair stylist |
| Maurizio Giustini | ... | makeup artist (as Maurice Giustini) |
Production Management
| Sergio Cortona | ... | production manager (as Sergio Savini) |
| Luigi Guasco | ... | production supervisor |
| Saro Patanè | ... | unit manager (as Saro Patane') |
| Bruno Sassaroli | ... | production supervisor |
Second Unit Director or Assistant Director
| Roberto Giandalia | ... | assistant director (as Robert Glands) |
Sound Department
| Vittorio De Sisti | ... | sound engineer (as Peter Danielson) |
| Gene Luotto | ... | post-synchronization: English version |
| Sandro Occhetti | ... | sound recordist |
| Pietro Spadoni | ... | sound technician |
Special Effects by
| Eugenio Ascani | ... | special effects (as Eugine Ascani) |
| Mario Bava | ... | special effects (uncredited) |
Stunts
| Bruno Ariè | ... | stunts (uncredited) |
| Aldo Canti | ... | stunts (uncredited) |
| Mario Ghignone | ... | stunts (uncredited) |
Camera and Electrical Department
| Giovanni Assenza | ... | still photographer |
| Giorgio Aureli | ... | assistant camera (as George Aureli) |
| Saverio Diamante | ... | camera operator (as S. James Diamond) |
| Teodorico Memé | ... | key grip (as Meme' Teodorico) |
| Giuliano Michisanti | ... | chief electrician |
Script and Continuity Department
| Serena Canevari | ... | script supervisor (as Merlini Canevani M. Serena) |
| Ines Bruschi | ... | continuity (uncredited) |
Additional Crew
| Alfredo Leone | ... | presenter: reissue prints |
| Pasquale Tagliaferri | ... | presenter |
| Carlo Alighiero | ... | voice dubbing: Goffredo Unger (uncredited) |
| Gabriella Genta | ... | voice dubbing: Elissa Pichelli (uncredited) |
| Renzo Palmer | ... | voice dubbing: Fausto Tozzi (uncredited) |
| Sergio Rossi | ... | voice dubbing: Giacomo Rossi Stuart (uncredited) |
| Rolf Tasna | ... | voice dubbing: Cameron Mitchell (uncredited) |
| Roberto Villa | ... | voice dubbing: Amedeo Trilli (uncredited) |
