The Devil's Rain (1975)
The Devil's Rain is a 1975 low-budget horror film, directed by Robert Fuest. It was one of several B-films in which William Shatner starred in between the original Star Trek television series and Star Trek: The Motion Picture. Other familiar names in the cast included Tom Skerritt, Ernest Borgnine, Eddie Albert, Ida Lupino, and Keenan Wynn. John Travolta also appeared in an early minor role. This was his film debut. Satanist Anton LaVey is credited as the movie's technical advisor, and appeared in the film playing a minor role.
More at Wikipedia.