Abby is a 1974 blaxploitation/horror film about a woman who is possessed by an African sex demon. The film starred William H. Marshall, best known for portraying the lead role in Blacula, Terry Carter, and Carol Speed as the title character, Abby. It was directed by William Girdler, who co-wrote the film's story with screenwriter Gordon Cornell Layne. The film was a financial success, but was pulled from theaters after the film's distributor, American International Pictures, were accused of copyright violation by Warner Bros., who saw the film as being derivative of The Exorcist, and filed a lawsuit against AIP.
Abby was filmed in 1974 in Louisville, Kentucky. Carol Speed landed the part of Abby after the original actress demanded a masseuse, for which the film's low budget had no provisions. Speed's agent recommended her to Girdler, and she flew to Louisville, meeting her director for the first time on the set.
In one scene, Speed's character was required to sing a song in church, and the song was one that Speed herself composed, "Is Your Soul A Witness?"
The production of the film was met with an unusual threat when Louisville experienced a series of tornadoes that tore through the area around the set of Abby. Speed recalled spending time with co-star Juanita Moore huddled in the lobby of their hotel, wrapped in blankets for protection. "Juanita and I immediately left the set when the daytime sky turned pitch black. We ended up rolled in some blankets on the lobby floor. Ramada had built this nice hotel, but no basement or tornado shelter. Just glass windows... everywhere.
William Marshall was vocal about his unhappiness with the production of Abby, mostly because he'd been promised certain script revisions that never materialized. Marshall did add certain elements to the film regarding the Yoruba religion.