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.
| Production | Amedeo Mellone | Producer |
| Production | Claudio Sinibaldi | Producer |
| Writing | Sergio Garrone | Writer |
| Directing | Sergio Garrone | Director |
| Art | Amedeo Mellone | Set Decoration |
| Crew | Carlo De Marchis | Special Effects Assistant |
| Sound | Stefano Liberati | Original Music Composer |
| Crew | Roberto Arcangeli | Special Sound Effects |
| Camera | Lino Galeassi | Assistant Camera |
| Sound | Enzo Diliberto | Sound Effects |
| Sound | Elio Maestosi | Original Music Composer |
| Production | Claudio Sinibaldi | Production Manager |
| Sound | Amedeo Timpani | Sound Engineer |
| Crew | Carlo Rambaldi | Special Effects |
| Costume & Make-Up | Maria Arié | Makeup Artist |
| Camera | Gianni Seso | Still Photographer |
| Sound | Roberto Arcangeli | Sound Effects |
| Editing | Bruna Abbatelli | Assistant Editor |
| Costume & Make-Up | Amedeo Mellone | Costume Designer |
| Production | Vincenzo Iaccio | Production Supervisor |
| Editing | Cesare Bianchini | Editor |
| Costume & Make-Up | Ivana Bernardi | Hairstylist |
| Production | Amedeo Mellone | Production Designer |
| Directing | Alessandro Praulano | Assistant Director |
| Crew | Emore Galeassi | Cinematography |
| Directing | Paola Patuani | Script Supervisor |
| Sound | Stefano Liberati | Conductor |
