Hey Arnold!: The Jungle Movie (Theatrical release)

Originally Hey Arnold!: The Jungle Movie would be released in theaters as a cinematographic film and the sequel/follow-up to the Season 5 episode, "Parents Day".

Plot
Arnold travels to San Lorenzo to discover the whereabouts of his parents Miles and Stella.

Why It Was Cancelled

 * 1) Hey Arnold!: The Movie was a box office bomb in the theaters, causing the original version of The Jungle Movie to be cancelled and leaving Hey Arnold! on a unresolved cliffhanger for years.

Results

 * The original version was permanently cancelled.
 * Years later, in 2015, it was announced by Nickelodeon that The Jungle Movie would finally be made, but this time it would be released on television instead. It premiered on Nickelodeon on November 24, 2017 and received a positive reception from fans and critics.