Directed by
| Paolo Heusch | ... | (credit only) |
| Mario Bava | ... | (uncredited) |
Writing Credits
| Virgilio Sabel | ... | (story) |
| Marcello Coscia | ... | (screenplay) and |
| Sandro Continenza | ... | (screenplay) |
Cast (in credits order)
| Paul Hubschmid | ... | John McLaren | |
| Madeleine Fischer | ... | Katy Dandridge (as Madeline Fischer) | |
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Fiorella Mari | ... | Mary McLaren |
| Ivo Garrani | ... | Prof. Herbert Weisse | |
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Dario Michaelis | ... | Peter Leduq (as Darrio Michaelis) |
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Sam Galter | ... | Randowsky |
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Jean-Jacques Delbo | ... | Sergei Boetnikov (as Jean Jacques Delbo) |
| Rest of cast listed alphabetically: | |||
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Annie Berval | ... | Lab Assistant (uncredited) |
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S. Louis Casta | ... | Doctor (uncredited) |
| Gérard Landry | ... | Landowsky (uncredited) | |
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Livio Lorenzon | ... | British General (uncredited) |
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Peter Meersman | ... | General van Dorff (uncredited) |
| Shane Rimmer | ... | John McLaren (voice) (uncredited) | |
| Giacomo Rossi Stuart | ... | Stuart (uncredited) | |
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Gianni Solaro | ... | French General (uncredited) |
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Massimo Zeppieri | ... | Dennis McLaren (uncredited) |
Produced by
| Samuel Z. Arkoff | ... | executive producer (uncredited) |
| Guido Giambartolomei | ... | producer |
Music by
| Carlo Rustichelli | ||
Cinematography by
| Mario Bava | ... | director of photography (as Mario Baja) |
Editing by
| Otello Colangeli | ||
Production Design by
| Beni Montresor | ||
Makeup Department
| Angelo Malantrucco | ... | makeup artist (as Angelo Malandrucco) |
| Ada Palombi | ... | hair stylist |
Production Management
| Armando Morane | ... | production manager |
Second Unit Director or Assistant Director
| Franco Rosetti | ... | assistant director |
Art Department
| Italo Tomassi | ... | manager of art department (uncredited) |
Sound Department
| Venanzio Biraschi | ... | sound effects |
| Oscar De Arcangelis | ... | sound effects (as Oscar Arcangelis) |
| Alain Roux | ... | sound recordist |
| William DeLane Lea | ... | dubbing director: English version (uncredited) |
| Carlo Rustichelli | ... | foley artist (uncredited) |
Special Effects by
| Mario Bava | ... | special effects (uncredited) |
Camera and Electrical Department
| Luigi Di Giorgio | ... | camera operator (as Luigi Giorgio) |
| Ubaldo Terzano | ... | camera operator (as Uraldo Terzano) |
| Vittorio Mazza | ... | still photographer (uncredited) |
| Antonio Rinaldi | ... | gaffer (uncredited) |
Music Department
| Luigi Urbini | ... | conductor (as Pierluigi Urbani) |
Script and Continuity Department
| Albino Cocco | ... | script supervisor (uncredited) |
Additional Crew
| Mario Colli | ... | italian voice dubbing: Paul Hubschmidt (uncredited) |
| Riccardo Cucciolla | ... | italian voice dubbing: Giacomo Rossi Stuart (uncredited) |
| Paul-Emile Deiber | ... | french voice dubbing: Dario Michaelis (uncredited) |
| Henry Djanik | ... | french voice dubbing: Livio Lorenzon (uncredited) |
| Paule Emanuele | ... | french voice dubbing: Madeleine Fischer (uncredited) |
| Paolo Ferrari | ... | italian voice dubbing: Dario Michaelis (uncredited) |
| Michel Gudin | ... | french voice dubbing: Gérard Landry (uncredited) |
| Georges Hubert | ... | french voice dubbing: Gianno Solaro (uncredited) |
| Marcelle Lajeunesse | ... | french voice dubbing: Fiorella Mari (uncredited) |
| Marcel Lestan | ... | french voice dubbing: Peter Meersman (uncredited) |
| Roldano Lupi | ... | italian voice dubbing: Jean-Jacques Delbo (uncredited) |
| Alberto Lupo | ... | italian voice dubbing: Gérard Landry (uncredited) |
| Jean-Claude Michel | ... | french voice dubbing: Ivo Garrani (uncredited) |
| Roland Ménard | ... | french voice dubbing: Paul Hubschmid (uncredited) |
| Jacques Thébault | ... | french voice dubbing: Giacomo Rossi Stuart (uncredited) |
| Luisella Visconti | ... | italian voice dubbing: Madeleine Fischer (uncredited) |