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)