- Mel Wellesdirector (as Montgomery Welles)
- Aureliano Luppico-director (uncredited)
- Umberto Borsatostory (as U. Borsato) and
- Egidio Gelsostory (as E. Gelso) and
- Aureliano Luppistory (as A. Luppi)
- Umberto Borsatoscreenplay (as U. Borsato) and
- Egidio Gelsoscreenplay (as E. Gelso) and
- Aureliano Luppiscreenplay (as A. Luppi)
- Mel Wellesscreenplay (uncredited)
- Edward Di Lorenzoscreenplay (uncredited)
- Dick Randallstory (uncredited)
- Mary Shelleynovel motifs (uncredited)
- Rosalba Neri(as Sara Bay)
- Marino Masé(as Peter Whiteman)
- Renate Kasché(as Renata Kashe, Renata Cash)
- Lorenzo Terzon(as Lawrence Tilden)
- Ada Pometti(as Ada Pomeroy)
- Joshua Sinclair(as Gianni Loffredo, Johnny Loffrey)
Rest of cast listed alphabetically
- Petar Martinovitch(as Peter Martinov)
- Herb Andress(uncredited)
- Ferruccio Fregonese(uncredited)
- Fulvio Mingozzi(uncredited)
- Romano Puppo(uncredited)
- Gualtiero Rispoli(uncredited)
- Umberto Borsatoexecutive producer (as Humbert Case)
- Gioele Centanniexecutive producer (uncredited)
- Roger Cormanproducer (uncredited)
- Harry Cushingexecutive producer (uncredited)
- Egidio Gelsoproducer (uncredited)
- Mel Wellesproducer (uncredited)
- Riccardo Pallottinicinematographer (as Richard Pallotin)
- Cleofe Conversieditor (as Cleo Converse)
- Amedeo Melloneart director (as Francis Mellon)
- Mauro Vigneticostume designer (as Maurice Nichols)
- Bianca Casellahair stylist (as Cass Whyte)
- Giuseppe Peruzzimakeup artist (as Ultimo Peruzzi)
- Augusto Dolfiproduction supervisor (as August Dolfis)
- Ferruccio Moscaproduction manager (as Frank Fly)
- Antonio Pittalisproduction secretary (as Tony Pitt)
- Joe Polliniassistant director (as Joseph Pollin)
- Angelo Vicariassistant director (as Anthony Bishop)
- Luciano Crovatoposter artist (uncredited)
- Franco Groppionisound (as Francesco Gruppioni, Francis Grappian)
- Corrado Volpicelliboom operator (as Corey Volpe)
- Carlo Rambaldianimation (as Charles Ramboldt)
- Domenico Cianfrigliastunts (uncredited)
- Riccardo Pizzutistunt actor (uncredited)
- Romano Puppostunt actor (uncredited)
- Raffaele Marinogaffer (as Raf Marino)
- Sergio Martinellicamera operator (as Serge Martin)
- Carlo Tafaniassistant camera (as Charles Taffan)
- Pio Matassicolor consultant
- Alberto Panciassistant editor
- Flavio Merkelscript supervisor (as Farley Merrell)
- Linda Garyvoice dubbing: Rosalba Neri (US version) (uncredited)
- Charles Howertonvoice dubbing (english version) (uncredited)
- Edward Mannixvoice dubbing: Andrea Aureli (english version) (uncredited)
- Marc Smithvoice dubbing: Mickey Hargitay (english version) (uncredited)
- Mel Wellesvoice dubbing: Herbert Fux (US version) (uncredited)
Crew verified as complete
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