Frankenstein's Bloody Terror (La Marca del Hombre Lobo, 1968)
This Spanish monster rally, given a completely irrelevant title for American audiences, made Paul Naschy (Jacinto Molina Álvarez) the undisputed king of Iberian horror movies, and created his most famous character, the wolfman Waldemar Daninsky. (Note the lack of Spanish names. To get away with horror films during the time of Franco, they had to be set somewhere else.)
The very brief American prologue, featuring very minimal animation of the Frankenstein monster becoming a werewolf, tries to excuse the title by claiming that the Frankenstein family suffered the curse of lycanthropy and became the Wolfstein family, but forget all that. It was only done because they needed a Frankenstein double feature. (The other one was the truly awful Dracula vs Frankenstein.)
Anyway, after this nonsense, we get the real movie. To my surprise, it's set in contemporary times. We first meet the characters I'll call Girl and Boy, young adults who seem to be sort of engaged. Next comes Waldemar, something of a spendthrift playboy. Girl falls in love with him anyway. Along the way we learn about the deserted castle wherein lies the body of a werewolf, kept in his coffin by a silver dagger in his heart. A couple of gypsies spend the night in the place, pull out the dagger, and the expected slaughter follows.
While everybody is hunting down the supposed wolves responsible for the killings, Waldemar saves Boy from the monster, but is wounded himself. Ordinary chains fail to keep him from rampaging in wolfman form at night, so Boy and Girl lock him up real well in the old castle while trying to find a cure. It seems to arrive in the form of a young doctor and his wife, but, in the movie's biggest plot twist, they turn out to be vampires, and wind up enslaving Boy and Girl, and reviving the first werewolf again. Monster movie mayhem ensues.
It's not a bad example of old-fashioned thrills, a little Universal, a little Hammer, and a little EuroGothic
stirred into a reasonably tasty paella.