Paul Hampton as Roger St. Luc

Joe Silver as Rollo Linsky

Lynn Lowry as Nurse Forsythe

Allan Kolman as Nicholas Tudor

Susan Petrie as Janine Tudor

Barbara Steele as Betts

Ronald Mlodzik as Merrick

Barry Baldaro as Detective Heller

Camil Ducharme as Mr. Guilbault

Hanna Poznanska as Mrs. Guilbault

Wally Martin as Doorman

Vlasta Vrana as Kresimer Sviben

Silvie Debois as Benda Sviben

Charles Perley as Delivery Boy

Al Rochman as Parkins

Julie Wildman as Miss Lewis

Arthur Grosser as Mr. Wolfe

Edith Johnson as Olive

Dorothy Davis as Vi

Joy Coghill as Mona Wheatley

Joan Blackman as Elevator Mother

Kirsten Bishop as Elevator Daughter

Fred Döderlein as Emil Hobbes

Sonny Forbes as Garbage Room Man

Nora Johnson as Laundry Woman

Cathy Graham as Annabelle

Robert Brennen as Boy

Felicia Shulman as Girl

Roy Wittan as Bearded Man

Denis Payne as First Elevator Man

Kevin Fenlow as Second Elevator Man

David Cronenberg as Infected Crowd Member (uncredited)