A curse affects the Preston family, caused by their betrayal of the Satanic priest Jonathan Corbis. Corbis has harassed the Preston family for generations to obtain a Satanic book of great power. Corbis captures patriarch Steve Preston, who is allowed to escape to warn his wife Emma and younger son Mark about Corbis' wrath. He tells them to give the book to Corbis, but during a rainstorm he melts into a waxy substance. Mark takes the book, hoping to meet with Corbis and defeat him. In a ghost town in the desert, Corbis gives Mark a drink of water from an old hand-pumped well. Mark drinks but then spits out the bitter water. He challenges Corbis to a battle of faith, then draws a pistol and aims it at him. Corbis belittles this threat and Mark tries to escape, but he is surrounded by Corbis' followers. He produces a cross, but Corbis transforms it into a snake and Mark discards it. Corbis' followers capture Preston, and Corbis uses a ritual to erase Mark’s memory in preparation for a ceremony later that evening. Mark's older brother, Tom, and his wife, Julie, search for Mark. They are accompanied by Dr. Sam Richards, a psychic researcher. Their search leads them to Corbis' church, where Corbis is performing a ceremony to convert Mark into one of his soulless minions; during the proceedings Corbis transforms into a Satanic goat-like demon. Tom witnesses all of this; he is discovered by the Satanists but eludes capture. Later he and Richards meet at the Satanic church, where they discover that the source of Corbis' power is an ornate glass bottle known as "The Devil's Rain", which contains the souls of Corbis' disciples. Corbis and the Satanists converge on the church. Richards threatens to destroy The Devil's Rain, but he is overpowered by the acolytes. He appeals to Mark's lost humanity and convinces him to destroy the bottle, which he does in defiance of Corbis' entreaties. A storm rages outside, and the Satanists melt in the rain. Tom and his wife make a hasty exit. As Tom holds his wife, it is revealed that he is actually embracing Corbis, and his wife's soul has become trapped within a new Devil's Rain.
The Devil's Rain was released in 1975, with screenings in New York on August 7 and Los Angeles on August 13, 1975.
Response
The Devil's Rain received a uniformly negative critical response, with the chief complaint being the incoherent storyline. The film's refusal to provide adequate scares was also widely criticized. Vincent Canby in The New York Times noted that "The Devil's Rain is ostensibly a horror film, but it barely manages to be a horror...It is as horrible as watching an egg fry." Roger Ebert in the Chicago Sun-Times said "All of this would be good silly fun if the movie weren't so painfully dull. The problem is that the material's stretched too thin. There's not enough here to fill a feature-length film." He gave the film 1½ stars out of four, and eventually added it to his "Most Hated" movies list. In his 2010 book Showgirls, Teen Wolves, and Astro Zombies, Australian film reviewer Michael Adams called The Devil's Rain "the ultimate cult movie": "It's about a cult, has a cult following, was devised with input from a cult leader, and saw a future superstar indoctrinated into a cult he'd help popularize." A cast of William Shatner's face used for this film would eventually be used to create a Captain Kirk mask. This mask would be painted white to serve as the mask of the slasher film villain Michael Myers in the Halloween franchise.
