Paul Konrad Muller is just a pawn in this nasty game of blood taking and giving! Just the kind of person you want working for you! He'll do anything, as long as he gets his fix! As he is also sometimes known, Paul Müller has some 242 titles to his credit, and there's a wanted poster hanging on a wall in The Dungeon with his picture on it!
The very atmospheric cinematography was done by none other than Mario Bava, who also ended up finishing the film as the director after the first director Riccardo Freda got into an argument with the producers! Almost the same exact thing happened when the two worked together a few years later on "Caltiki The Undying Monster!"
"I Vampiri" was composed by Franco (Hercules, Prisoner Of Evil) Mannino and Roman (Caltiki The Undying Monster) Vlad!