Svengoolie: The Devil's Rain (1975)

 

Directed by Robert Fuest. Ernest Borgnine, William Shatner, Keenan Wynn, Eddie Albert, Ida Lupino, Tom Skerritt. 

https://en.wikipedia.org/wiki/The_Devil%27s_Rain_(film)

https://www.rogerebert.com/reviews/the-devils-rain-1975

https://www.denofgeek.com/movies/the-devils-rain-one-of-the-strangest-horror-movies-of-all-time/

https://www.thespinningimage.co.uk/cultfilms/displaycultfilm.asp?reviewid=566