 Nico McEown played the young bully in the flashback introduction, Tracy Trueman played Robert Dunn's ex-girlfriend Amy, and John Dadey acted as the murdered Dr. Blinn.The episode's main guest star was Frank Whaley, who played Robert/Regina/Martin.Whaley had been an actor on "NCIS" and "The Dead Zone" before his role on the episode, and was described as an actor who fades into the background.