Trivia / The X-Files S06 E19 "The Unnatural"

• The Other Marty: Darren McGavin was supposed to reprise his role as Arthur Dales. McGavin filmed a few of his scenes before suffering a stroke, and he was replaced by M. Emmett Walsh with a quick rewrite to explain that he was the original Arthur's brother. McGavin's scenes for this episode were included as a bonus feature on the episode's DVD release.
• Written by Cast Member / Directed by Cast Member: David Duchovny wrote and directed this episode.