La Noche de Walpurgis /Walpurgis Night (released in the United States as The Werewolf vs. The Vampire Woman, in the UK as Shadow of the Werewolf, and in Canada as Werewolf Shadow), is a 1970 Spanish/German horror film starring Paul Naschy, the fifth in his series about the werewolf Waldemar Daninsky. This film was directed by León Klimovsky and written by Paul Naschy, and is generally regarded to have kickstarted the Spanish horror film boom of the 1970s (as well as Naschy's career). This was Naschy's all-time most financially successful film. It was also the first of 8 films that he would make with director Leon Klimovsky at the helm.

Plot

Following the events in The Fury of the Wolf Man, the deceased lycanthrope Waldemar Daninsky is revived to life when two country doctors surgically remove two silver bullets from his heart while performing an autopsy on him. Waldemar transforms into a werewolf, kills the doctors and escapes from the morgue. Some time later, two students, Elvira (named after Naschy's real-life wife of 40 years) and her friend Genevieve, go searching for the tomb of medieval murderess Countess Wandessa Darvula de Nadasdy. They find a possible gravesite in the vicinity of Waldemar Daninsky's castle, and the handsome count invites the girls to stay for a few days while they investigate the site.