Hey Arnold! was an American animated television show on the Nickelodeon network. The main character is a boy with a football-shaped head named Arnold. A bully, or mean girl named Helga Pataki who loved him is another character. The show was about their lives in Hillwood, a made up great town in the north like New York City, Chicago, or Seattle.
The series was on Nickelodeon from October 7, 1996 until June 8, 2004. Episodes of Hey Arnold! are about 23 minutes each. Later on, Nickelodeon made a movie from it.