The English-dubbed version is in the Public Domain, although the original Spanish-language version isn't.
One of 13 titles included in Avco-Embassy's "Nightmare Theater" package syndicated for television in 1975, along with two other Paul Naschy entries, Horror Rises from the Tomb (1973) and The Mummy's Revenge (1975).
The first film to involve a yeti as the catalyst that transforms Waldemar into a werewolf (the "yeti origin" appearing again in Night of the Howling Beast (1975). Paul Naschy followed this film with Curse of the Devil (1973), which became the highest-grossing film in the series.
Not released until 1972, due to problems involved in finding a distributor.
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