The main title sequence of the Hey Arnold! TV Series was animated by Toon-Us-In Animations Inc. and U.S. Animation.
Its duration is approximately 49 seconds. Starting with Season 4 the music for the intro was remixed, and the animation when Helga says "Arnold" was slightly sped up.
In the Arnold's Christmas intro, the Roland D-50 internal patch "Fantasia" was heard.
In some of the special episodes, the intro is omitted. The episodes that skip the intro are "Arnold's Christmas", "Arnold's Thanksgiving", "School Play", "Parents Day", "Dino Checks Out" and "The Journal".Several dubs including the Russian dub have the characters (other than Helga) can actually be heard emitting various noises (no actual words).
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