Alex Nijinski (Kinski) is een dokter die per ongeluk stuit op een geheim laboratorium. Als hij even een kijkje in het lab neemt, verandert hij in een gespleten persoonlijkheid. Zijn alter ego is helaas niet al te vriendelijk en gaat moorden.
Nee, helaas is Le amanti del mostro nog niet beschikbaar op Netflix in Nederland.
| Directing | Sergio Garrone | Director |
| Writing | Sergio Garrone | Writer |
| Production | Amedeo Mellone | Producer |
| Production | Claudio Sinibaldi | Producer |
| Sound | Stefano Liberati | Original Music Composer |
| Sound | Elio Maestosi | Original Music Composer |
| Crew | Emore Galeassi | Cinematography |
| Editing | Cesare Bianchini | Editor |
| Production | Amedeo Mellone | Production Designer |
| Art | Amedeo Mellone | Set Decoration |
| Costume & Make-Up | Amedeo Mellone | Costume Designer |
| Costume & Make-Up | Maria Arié | Makeup Artist |
| Costume & Make-Up | Ivana Bernardi | Hairstylist |
| Production | Vincenzo Iaccio | Production Supervisor |
| Production | Claudio Sinibaldi | Production Manager |
| Directing | Alessandro Praulano | Assistant Director |
| Sound | Roberto Arcangeli | Sound Effects |
| Crew | Roberto Arcangeli | Special Sound Effects |
| Sound | Enzo Diliberto | Sound Effects |
| Sound | Amedeo Timpani | Sound Engineer |
| Crew | Carlo Rambaldi | Special Effects |
| Crew | Carlo De Marchis | Special Effects Assistant |
| Camera | Lino Galeassi | Assistant Camera |
| Camera | Gianni Seso | Still Photographer |
| Editing | Bruna Abbatelli | Assistant Editor |
| Sound | Stefano Liberati | Conductor |
| Directing | Paola Patuani | Script Supervisor |
