A convicted strangler, studying the paranormal in his jail cell, learns to make himself invisible. As an invisible man, he escapes from prison to stalk and strangle the five women who testified against him at his trial. Robert Foxworth plays the police lieutenant assigned to protect them, and to catch the invisible strangler.
Directors: John Florea, Gene Fowler Jr.
Stars: Robert Foxworth, Stefanie Powers, Sue Lyon.
Color. Runtime: 85 minutes.