Nealon had a recurring television role on the 2002-06 CBS comedy "Still Standing" playing Ted Halverson, the Millers' competitive and religious neighbor. He also appeared as a patient in a mental institution on the first season of "Monk". "Deja Vu" is an episode of "The Outer Limits" television show. It first aired on 9 July 1999, during the fifth season. Nealon played Dr. Mark Crest. Nealon also had an ongoing supporting role as Doug Wilson on the show "Weeds" on Showtime. In 2009–2011 he voiced the title character in Nick at Nite's animated series "Glenn Martin, DDS".