"Hey Arnold!" is an animated television series that aired on Nickelodeon from 1996 to 2004. The show follows the adventures of a young boy named Arnold, who lives in a city filled with quirky characters. Arnold is known for his distinctive football-shaped head and his kind-hearted nature. Each episode explores themes of friendship, family, and growing up. The series features a diverse cast of characters, including Arnold's best friend Gerald, his crush Helga, and his eccentric grandparents, Phil and Gertie. The show is set in a vibrant urban environment, showcasing the challenges and joys of childhood in a big city.