Demonstrating that a little knowledge is a dangerous thing, a convicted strangler studies the paranormal and finds a way to render himself invisible. Once he escapes, he sets out to find and eliminate five women who remind him of the mother he murdered. A police lieutenant sets out to safeguard them and bring the invisible killer to justice.
Robert Foxworth
as Lt. Charles Barrett
Stefanie Powers
as Candy Barrett
Sue Lyon
as Darlene DeLong
Mark Slade
as Detective Holt
Leslie Parrish
as Colleen Hudson
Marianna Hill
as Bambi Greer
Elke Sommer
as Chris Hartman
Percy Rodriguez
as Captain Wells
Alex Dreier
as Dr. Ulmer
Rayford Barnes
as Sgt. Archer
Frederick Tully
as Detective Sloan
Frank Ashmore
as Roger Sands - The Invisible Strangler
