Linda Blair as Mary Hampton

Dan Haggerty as Sgt. Vince Marlow

Troy Donahue as Dr. Miller

Jack De Rieux as Joseph Davenport Sr. (as Jack De Ruiex)

Ron Vincent as Joe Davenport, Jr.

Michael Jacobs as Mark Evans

John Flanagan as Steve Carson

Steve Gluck as Jerry Kardell

Peggy Duncan as Lisa Burton

Jack A. Sunseri as Thug #1

Rick Blanchard as Tony Rizzo / Thug #2

Jim Thrasher as Thug #3

Roger Wallace as Thug #4

Neil O'Neill as Dr. Nevin

Robert Clark as KC Power Man #1

Matthew Riley as KC Power Man #2