The film was released theatrically in the United States in 1977 by Independent International Pictures under the title Night of the Howling Beast. The subsequent VHS release came from Super Video. The film has been released on DVD in its native Spain by Tripictures. It was released on VHS alternately as Hall of the Mountain King, Night of the Howling Beast and also as The Werewolf and the Yeti in the 1980s.
The trivia item below may give away important plot points.
This film ignored the events from the earlier films The Fury of the Wolfman (1970) and Curse of the Devil (1972), and provided an all-new origin for Waldemar's lycanthropy, having the curse transmitted by the bites of not one, but two, vampire women!