Don Davis was cast as Agent Scully's father and was one of several "Twin Peaks" actors to appear in the series. Davis returned as William Scully in "One Breath" (season 2). Sheila Larken, who played Scully's mother, Margaret, is the wife of the show's co-executive producer R.W. Goodwin. Larken returned for a further 15 episodes in the role. Morgan and Wong fought hard to have veteran film actor Brad Dourif play the role of Luther Lee Boggs against concerns about the cost of hiring him. "X-Files" creator Chris Carter called the president of Twentieth Century Fox, Peter Roth, during thanksgiving dinner and convinced him to let them cast Dourif for the part. Dourif was asked to appear in the episode with only four days of preparation. He originally refused the part, until the producers gave him an extra week to prepare. While getting into character between takes, his deep breathing exercises turned his face bright purple.