The animation, though hand-drawn, has an exaggerated flatness that gives “Hey Arnold!” an engaging look that seems to grow organically out of its characters’ quirky tics and moods.

According to Variety, “The announcement comes amidst Nickelodeon’s 25th anniversary celebration of original creator-driven animation.” Hey Arnold!: ...

The Jungle Movie ” during the 25 Years of Nickelodeon Animation panel at Comic-Con. The artwork included six photos featuring the title character, Arnold, as well as Helga, Gerald, Phoebe ...