Il mostro dell’opera is not quite what you’d call an adaptation but more an experimental variation of The Phantom of the Opera. But it’s unlikely that viewers will come to this side of Eurocult obscurity just to see what replacing The Phantom with a Count Dracula-esque vampire in a beloved and well-known canon would be like; most probably seek this out because of the movie’s co-writer/director Renato Polselli. I know I did.
If you’re a fan of Polselli’s The Vampire and the Ballerina (1960), of which this makes a good double bill with, you are going to love this, and if you’re a fan of Polselli’s delirious S&M fever nightmares from the early ‘70s, you’ll love this too, because Il mostro dell’opera is like a predecessor to Delirium (1972) and Rites, Black Magic and Secret Orgies in the Fourteenth Century (1973) aka The Reincarnation of Isabel – minus the turbulent editing. It builds on everything that made The Vampire and the Ballerina a fun time but is progressive in a sense with certain erotic and expressionistic elements that in contrast to its old-fashioned, classic look makes it feel ahead of its time.