text: McKean's television guest appearances include The Simpsons; Star Trek: Voyager; Boy Meets World; Murder, She Wrote; Murphy Brown; Lois and Clark: The New Adventures of Superman; Friends; and Caroline in the City. In 1998, he guest starred in a two-part episode of The X-Files titled "Dreamland," in which his character Morris Fletcher switched bodies with Fox Mulder. The character was a success, reappearing in 1999's "Three of a Kind," an episode which focused on the recurring characters of The Lone Gunmen. The character appeared on the short-lived spin-off series in 2001, and then returned to The X-Files in its final season for an episode called "Jump the Shark."
  McKean reunited with Christopher Guest in Best in Show (2000) and appeared in Little Nicky (2000), The Guru (2002), And Starring Pancho Villa as Himself (2003), and A Mighty Wind (2003), in which The Folksmen are played by the actors who played as Spinal Tap. McKean had a regular role as the brassy, heavily made-up bandleader Adrian Van Voorhees in Martin Short's series Primetime Glick. He also had guest roles on such shows as Law & Order, Family Guy, SpongeBob SquarePants, and Harvey Birdman, Attorney at Law. He did voiceover work as Henry's cousin Louie on Oswald, which coincidentally featured the voice of David Lander as Henry. He lent his voice to an episode of Kevin Smith's Clerks: The Animated Series that never aired but was included on the VHS and DVD versions of the series.