Hey Arnold! The Jungle Movie (partially found production material of cancelled original adaptation of Nickelodeon animated series film; 2002)
From The Lost Media Wiki
Hey Arnold!: The Jungle Movie is an animated feature film based on the Nickelodeon animated series Hey Arnold! that was to be released in 2002. Nickelodeon was going to release this as the theatrical Hey Arnold movie, but Nickelodeon decided that the movie Arnold Saves The Neighborhood should get one instead. Despite it flopping, Nickelodeon was still interested in making the movie, but cancelled the project in 2004 after Craig Bartlet left Nickelodeon. A fourty-second test clip of movie has been found, but it is unknown if any other footage had been made for the movie.