''Hey Arnold!'' (1996-2004) is a children's animated TV series created by [[WesternAnimation/TheSimpsons Matt Groening's]] brother-in-law, Creator/CraigBartlett, starring an eclectic -- and more often than not eccentric -- group of characters that navigate a sort of urban wonderland. It is the 6th cartoon in the Franchise/{{Nicktoons}} series.

Arnold is a generally mellow 4th-grader with a head shaped like an American football, who lives with his [[RaisedByGrandparents paternal grandparents]] and their (also eccentric) tenants in a boarding house in Hillwood, Washington. [[BlackBestFriend Gerald]] is his best friend and "the Keeper of [[UrbanLegend Urban Lore]]," who dispenses legendary tales of characters such as "Stoop Kid" (said to have been born on the stoop he can be seen, day or night, to glower from with promised vengeance to any who should think to violate his sacred site) or "Wheezin' Ed" (rumored to have a massive treasure cavern on the mysterious Elk Island).

Also notable among Arnold's neighbors and classmates is Helga Pataki, a female bully who [[LovingBully openly scoffs at Arnold's positive attitude while secretly having a massive crush on him]]. As the show developed, an increasing amount of focus was put on her [[{{Tsundere}} extremely conflicted]], melodramatic character and her utter ''obsession'' with the football-headed one - [[StalkerShrine including her shrines dedicated to him]].

The show had a number of episodes dealing with the rather mundane aspects of childhood life, such as the crush on teacher episode, but also ventured into the surreal, such as Arnold and Gerald encountering the [[AbsurdlySpaciousSewer labyrinthine realm of the Sewer King]] to retrieve Arnold's grandfather's watch, and having to duel with him to avoid being declared his "royal rat groomers." In later seasons more attention was paid to the LoveTriangle between Helga, Arnold, and Lila, the sickeningly sweet country girl who likes Arnold but does not ''like''-him like him (much to Arnold's chagrin), Helga's transparently dysfunctional and unhappy family life, and the mystery of Arnold's [[ParentalAbandonment missing parents]].

It premiered in 1996, and wound up production in 2001 (though the last episode wouldn't be seen until 2004). It had a theatrical movie in 2002 titled ''Hey Arnold!: The Movie'', originally intended as a TV movie called "Arnold Saves the Neighborhood". Unfortunately, the film didn't fare too well in the box office or the critics. This led to the cancellation of the show's planned second film, "The Jungle Movie". And there... we have trouble. The second movie was the impending GrandFinale of the show, intended to give closure on the fate of Arnold's parents and his feelings towards Helga. For over a decade after the show's cancellation, fans continued to do all they could to bring The Jungle Movie to fruition...

[[http://comicbook.com/2015/11/23/nickelodeon-developing-hey-arnold-tv-movie/ ...and their efforts eventually paid off]], with a '''[[TrilogyCreep two-part]] [[TwoPartTrilogy film]]''' in the works.

[[TheWikiRule Has an excellent Wiki]] [[http://heyarnold.wikia.com/wiki/Hey_Arnold_Wiki here]], as well as a [[http://tvtropes.org/pmwiki/crowner.php/BestEpisode/HeyArnold Best Episode Crowner.]]
* HeyArnold/TropesAToI
* HeyArnold/TropesJToP
* HeyArnold/TropesQToZ