Jennifer O'Neill as Kim Obrist

Stephen Lack as Cameron Vale

Patrick McGoohan as Dr. Paul Ruth

Lawrence Dane as Braedon Keller

Michael Ironside as Darryl Revok

Robert A. Silverman as Benjamin Pierce

Lee Broker as Security One

Mavor Moore as Trevellyan

Adam Ludwig as Arno Crostic

Murray Cruchley as Programmer 1

Fred Döderlein as Dieter Tautz

Géza Kovács as Killer in Record Store

Sonny Forbes as Killer in Attic

Jérôme Tiberghien as Killer in Attic

Denis Lacroix as Killer in Barn

Elizabeth Mudry as Killer in Barn

Victor Désy as Dr. Gatineau

Louis Del Grande as First Scanner

Anthony Sherwood as Scanner in Attic

Ken Umland as Scanner in Attic

Anne Anglin as Scanner in Attic

Jock Brandis as Scanner in Attic

Jack Messinger as Scanner at Door

Victor Knight as Dr. Frane

Karen Fullerton as Pregnant Girl

Margaret Gadbois as Woman in Mall

Terrance P. Coady as Security 1 Car Passenger

Steve Michaels as Security 1 Car Driver

Malcolm Nelthorpe as Security 2 Car Driver

Nicholas Kilbertus as Security 2 Car Partner

Don Buchsbaum as Large Man in Mall

Roland Nincheri as Large Man in Mall

Kimberly McKeever as Hallucinating Guard

Robert Boyd as Hallucinating Guard

Graham Batchelor as Yoga Technician

Dean Hagopian as Programmer 2

Alex Stevens as Programmer 3

Neil Affleck as Student

John Brasington as Hazmat-Suit Worker (uncredited)

Chris Britton as Hazmat-Suit Worker (uncredited)

Jack Canon as Hazmat-Suit Worker (uncredited)

Richard Chapman Jr. as Hazmat-Suit Worker (uncredited)

Leon Herbert as Hazmat-Suit Worker (uncredited)

William Hope as Hazmat-Suit Worker (uncredited)

Thomas Kovacs as Boyfriend (uncredited)

Michael Maloley as Doctor in Hall (uncredited)

Ian McQue as Scanner / Security Guard (uncredited)

Chuck Shamata as Tony (uncredited)

Sam Stone as Security Guard (uncredited)