Olivia Hussey as Jess

Keir Dullea as Peter

Margot Kidder as Barb

John Saxon as Lt. Fuller

Marian Waldman as Mrs. Mac

Andrea Martin as Phyl

James Edmond as Mr. Harrison

Doug McGrath as Sargeant Nash

Art Hindle as Chris

Lynne Griffin as Clare

Michael Rapport as Patrick

Leslie Carlson as Graham

Martha Gibson as Mrs. Quaife

John Rutter as Laughing Detective

Robert Warner as Doctor

Sydney Brown as Farmer

Jack Van Evera as Search Party

Les Rubie as Search Party

Marcia Diamond as Woman

Pam Barney as Jean

Robert Hawkins as Wes

David Clement as Cogan

Dave Mann as Cop

John Stoneham Sr. as Cop

Danny Gain as Cop

Tom Foreman as Cop

Bob Clark as Prowler Shadow / Phone Voice (uncredited)

Nick Mancuso as The Prowler / Phone Voice (uncredited)

Ann Sweeny as Phone Voice (voice) (uncredited)

Gerry Arbeid as Cab Driver (uncredited)