Michael Sarrazin as Michael Taylor

Susan Clark as Paula West

Anthony Perkins as Lawrence Miles

Howard Duff as Lester Harlen

Kate Reid as Mrs. Swanscutt

Al Waxman as Dellassandro

Elizabeth Shepherd as Frances

Kenneth Welsh as Dr. Klifter

Ken James as City Editor

Lee Broker as Bartender

John Candy as John

Douglas Campbell as The Walker

Maury Chaykin as Rollins

John Friesen as Trucker

Joe Flaherty as Roger

David Gardner as Cunningham

Ron Hartmann as Howell

Michael Ironside as Edgar

Eugene Levy as Matt

Kate Lynch as Stewardess

Sabina Maydelle as Penelope

Bob McHeady as Electrician

Heather McKay as Squash Pro

Catherine O'Hara as Judith

Pita Oliver as Lorraine

Vivian Rakoff as Dr. Wright

Dave Thomas as Howie

Bob Warner as Detective

Charles Dennis as Reporter in Newspaper Office (uncredited)