Trailer
Images
 | Klaus Kinski as John Alexander |
 | Christiane Krüger as Christine |
 | Günther Stoll as Inspektor Steevens |
 | Annabella Incontrera as Liz |
 | Margaret Lee as Helen Alexander |
 | Sydney Chaplin as Mr.Brown |
 | Barbara Nelli as Alice |
 | Ignazio Dolce |
| Carlo Marcolino as Servant |
 | Gastone Pescucci as Peter |
| Luciano Spadoni as Inspector Gordon |
 | Claudio Trionfi |
 | Bedy Moratti as (uncredited) |
 | Fulvio Pellegrino as Policeman (uncredited) |
 | Domenico Ravenna as Spectator at horse race (uncredited) |
 | Alfred Vohrer as Edgar Wallace (voice) (archive footage) (uncredited) |
 | Alice Arno as (hardcore inserts - French 1976 version) |
| Directing | |
| Riccardo Freda | Director |
Writing | |
| Riccardo Freda | Screenplay |
| Lucio Fulci | Story |
| Paul Hengge | Screenplay |
| Romano Migliorini | Story |
| Gianbattista Mussetto | Story |
| Edgar Wallace | Novel |
Sound | |
| Nora Orlandi | Original Music Composer |
Camera | |
| Gábor Pogány | Director of Photography |
Editing | |
| Anna Amedei | Editor |
| Jutta Hering | Editor |
Art | |
| Luciano Spadoni | Production Design |
Production | |
| Oreste Coltellacci | Producer |
