Avatar: Escape From the Spirit World

Synopsis
These comics first appeared alongside a game on Nickelodeon’s site. The whole thing was written by the writers of the show, so it’s completely canon and available in the Book 2 DVD box set. It shows what went on during the gap between Book 2 and Book 3 (among other things).

(Source: u/ScoopsHaagenDazs)

Background
Every Saturday starting on February 3rd 2007, there would be a new code that would be on TV where you would enter it into the game so that you can see a new episode of this. All episodes included in Avatar: The Last Airbender - The Complete Book Two: Earth Collection DVD and Avatar: The Last Airbender - The Complete Series BD.