This Day in Halloween: Mario Bava's "Black Sabbath" opens in the U.S. in 1964 starring Boris Karloff. / Illustration by CJ Lundblad

May 6, 2020

Black Sabbath opens in the U.S. in 1964. Mario Bava’s anthology horror film stars Boris Karloff, who contracted pneumonia during the production. The film is still regarded as one of Italy’s best horror films.