The Astral Factor (1978)
Genres: Thriller, Horror
Cast: Robert Foxworth, Stefanie Powers, Sue Lyon, Elke Sommer, Cesare Danova, Marianna Hill, Mark Slade
Invisible Strangler is a 1984 American horror film directed by John Florea, an alternate cut of the 1978 film The Astral Factor, also known as The Astral Fiend, starring Robert Foxworth, Stefanie Powers, Cesare Danova, Sue Lyon and Elke Sommer. Arthur C. Pierce wrote the screenplay and co-directed the film uncredited.