What movie and television projects has Gordon Masterton been in?

Gordon Masterton is primarily known as a horror and thriller writer, not an actor or director. He has not been involved in any movie or television projects in the sense of appearing in them or directing them.

However, several of his novels have been adapted for film and television:

* The Manitou (1978): A horror film based on his novel of the same name.

* The Blood on Satan's Claw (1971): A British horror film based on his novel "The Devil's Advocate".

* The Ninth Configuration (1980): A science fiction film partly inspired by his novel "The Devil's Advocate".

* The Ritual (2017): A Netflix horror film loosely based on his novel of the same name.

It's important to note that while these films are based on Masterton's work, the adaptations often take significant liberties with the original source material.