Boer in All I Want for Christmas. Other films in which he has since appeared include Happy Gilmore, The Wedding Singer, Anger Management, Little Nicky, Just Go with It, Daddy Day Care, Good Boy!, and Aliens in the Attic (2009). He has a part in many of Adam Sandler's Happy Madison films, including Grandma's Boy (2006), You Don't Mess with the Zohan (2008), and Father of the Year (2018), and made a cameo appearance in the 2008 film Get Smart. In the mid-1990s, Nealon played himself in three episodes of The Larry Sanders Show. The most popular episode was titled "The New Writer" when he starts hanging around the office so much that Hank (played by actor Jeffrey Tambor) is worried Nealon is trying to steal his job. Garry Shandling and Nealon had a close relationship. In 1994, Nealon hosted the 13-part series Amazing America on the Discovery Channel. 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. Nealon played Dr. Mark Crest in "Deja Vu", an episode of The Outer Limits television show. It first aired on July 9, 1999, during the fifth season. From 2005 to 2012, Nealon 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. In 2002, he hosted The Conspiracy Zone on The New TNN for 26 episodes plus an unaired pilot. In 2004, he hosted the first season of Poker Royale on the Game Show Network. Nealon also hosted several years of World's Funniest Commercials specials on TBS in the 2000s. In 2008, he published a book chronicling his experiences during his wife's pregnancy, Yes, You're Pregnant, But What About Me?. Starting in 2015, Nealon portrayed Captain Telstar in commercials for Charter Spectrum. From 2016 to 2020, he was a regular on the TV sitcom Man with a Plan, Since 2017 he has also hosted a YouTube talk show called Hiking with Kevin where we hikes a trail with various celebrity guests; the idea came about when during a hike with Matthew Modine they ran out of breath, and Nealon thought it'd be funny to record their inability to talk. As of 2022, the