Howl Of The Devil (1988)

aka: El Aullido Del Diablo

A young boy finds himself trying to deal with horrible memories resurfacing of a hideous family secret. He sees visions of various monsters, including The Phantom of the Opera, Dracula, Frankenstein's monster, the Werewolf, Fu Manchu and others. Eventually, the zombie of a man's twin brother comes back from the grave with a terrifying revelation. With Paul Naschy and Caroline Munro. (In Spanish language and uncut).