The Beast of the Yellow Night (1971)
Satan saves Joseph Ashley from death on the condition that he become his disciple (and, as it turns out, a hairy murderous beast).
Directed by: Eddie Romero
Starring: John Ashley, Mary Charlotte Wilcox, Leopoldo Salcedo, Eddie Garcia, Ken Metcalfe, Vic Diaz
Links: IMDb, Movie posters, Movie stills