This is the pilot pitch for the Nickelodeon series "Avatar: The Last Airbender". It never aired on TV, but it was screened at conventions and debuted on DVD on the Book 1 collection.
Katara was named Kya in this pilot, and her hairstyle was slightly different.
Bryan Konietzko and Michael Dante DiMartino both lived in Seoul, South Korea for four months to supervise the Korean studios working on the pilot. They also animated with the Korean animators.