"A fourth grader and his best friend set out to stop an industrialist from bulldozing their town."
"When a powerful developer named Mr. Scheck wants to knock down all the stores and houses in Arnold's neighborhood to build a huge "mall-plex", it looks likes the neighborhood is doomed to disappear. But with the help of a superhero and a mysterious deep-voiced stranger, Arnold and Gerald will need to recover a crucial document in order to save their beloved neighborhood."
(Above taken from this page).
I always enjoyed the Nickelodeon show, "Hey Arnold!"... I enjoyed the movie just as much as I'd enjoyed the show in the past!