The synopsis goes something like this ...
This Spanish-made film is the first in a series featuring the legendary Naschy as Count Waldemar Daninsky the werewolf. The Count is attacked one evening while out hunting by a werewolf, who, when in human form goes by the name of Imre Wolfstein. After eventually turning into a furry beast himself and going on a killing-spree, the Count seeks help from a couple of local vampires, but they end up betraying him by pitting him against Wolfstein, who they have resurrected from the grave.