John Harding

as Marco

as Johnny Allen (uncredited)

as Johnson

as Norman McQuarry

as Sullivan

as Attorney

as Barry Metcalfe

as Rick Day

as Collins

as Greg Trent

as Frank Bosworth

as Toby Winslow

as Worried Boss

as Dr. Lambert

as Dr. Hackett

as Director

as Harvey Rockwell

as Milo Seymour

as Fred Swanson

as Neville Stern

as Salter

as Richard