LaVey was also in Kenneth Angerâ s film Invocation of my Demon Brother , and helped as a technical adviser in The Devil 's Rain , which starred Ernest Borgnine , William Shatner , and introduced John Travolta . LaVey appeared in Kenneth Anger 's film Invocation of my Demon Brother , acted as technical adviser on The Devil 's Rain , which starred Ernest Borgnine , William Shatner , and introduced John Travolta .