Hey Arnold!: The Jungle Movie

Arnold and his classmates travel to San Lorenzo, a Central American country, to solve the mystery of his parents' disappearance. Along the way, Arnold's pet pig Abner stows away in his backpack, and they are aided by Helga, who secretly has a crush on Arnold. They encounter a group of children living in a "sleeping sickness"-stricken city, where they must navigate traps and fight against a mercenary named Lasombra. In the end, Arnold and his friends defeat Lasombra, and Arnold is reunited with his parents, who have also fallen ill.