La Furia del Hombre Lobo (Fury of the Wolfman), also known as The Wolfman Never Sleeps, is a 1970 Spanish horror film that is the fourth in a long series about the werewolf Count Waldemar Daninsky, played by Paul Naschy. It was not released until 1972, due to problems involved in finding a distributor.
This was the first film to involve a yeti as the catalyst that transforms Waldemar into a werewolf (the "yeti origin" appearing again in La Maldicion de la Bestia in 1975). Naschy followed this film up with a sequel called La Noche de Walpurgis (1970), which became the highest-grossing film in the series.
