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 [theatrical] and as Werewolf Shadow [dvd]), is a 1971 Spanish horror film starring Paul Naschy, the fifth in a series about the werewolf Waldemar Daninsky. This film was directed by León Klimovsky and written by Naschy, and is generally regarded to have kickstarted the Spanish horror film boom of the 1970s, due to its box office success upon its release. The German distributors added the name Hans Munkel to the screenwriting credit in some versions to satisfy the terms of international co-production. Patty Shepard was so convincing as the vampiric Countess, it was thought at the time that she might replace actress Barbara Steele as Europe’s reigning horror queen.