Mario Bava’s Black Sabbath (titled I tre volti della paura in his native Italian) is a trilogy of short horror films, presented as a single feature. There is nothing to tie the three films together aside from being bookended by a rather funny and tongue in cheek Boris Karloff who also appears in the middle film. Like much of Bava’s work the film’s original Italian version differs greatly from the more widely seen American release and there’s a fantastic comparison feature on DVD releases which highlights the differences in score, props, dialogue and even ordering of the film. Personally I chose the Italian version to watch.
The Italian version is a little gorier and features a lesbian subplot which is absent from the American release. Bava’s choice to package the films in one feature at first feels strange but to be honest, I don’t think any of the stories could have been successfully stretched to make a feature in their own right and it gives a chance for some terrific tales to get a release.