The TV show Hey Arnold! premiered on Nickelodeon, introducing the world to the adventures of Arnold and his friends in the fictional city.
The second season of Hey Arnold! aired, continuing to build the show's popularity.
Hey Arnold! The Movie was released in theaters, expanding the franchise beyond television.
Nickelodeon announced Hey Arnold! The Jungle Movie, intended to provide closure to the series.
Hey Arnold! The Jungle Movie premiered on Nickelodeon, concluding unresolved storylines from the original series.
Arnold arrives in the city of Hillwood and starts living with his grandparents.
Arnold befriends Gerald, Helga, and other kids in the neighborhood, starting many adventures.
Helga reveals her secret affection for Arnold in a personal diary entry and various moments.
Arnold uses his kindness and problem-solving skills to help friends and neighbors on several occasions.
Grandpa Phil shares stories about his and Grandma Gertie's past, enriching Arnold's family history.
Despite Helga's usual hostility, Arnold and Helga collaborate on school projects and neighborhood activities.
Arnold's journey to uncover the mystery behind his parents' disappearance unfolds.
Arnold reunites with his missing parents, resolving a long-standing mystery.
