Friday the 13th: The Series (1987)

S3E10 Mightier Than the Sword

A well-known writer famous for his detailed biographies of serial killers attributes his success to an ancient pen. As he pens a chilling account of a serial killer’s crimes, he uses the pen to "infuse" the narrative into the killer. This curse transforms the subject into a killer who acts out the story's violence, compelled to murder. Eventually caught, the author extracts the malevolence just before the killer’s execution, leaving them bewildered and ultimately dead. Micki finds herself targeted next, but Jack and Johnny intervene just in time to prevent her from claiming any victims other than the author.