created by Michael Dante DiMartino and Bryan Konietzko and produced by Nickelodeon Animation Studio. 

Starring Zach Tyler Eisen Mae Whitman Jack DeSena Dante Basco Dee Bradley Baker Mako Jason Isaacs  

 The season revolves around the protagonist Aang and his friends Katara and Sokka going on a journey to the North Pole to find a Waterbending master to teach Aang and Katara. The Fire Nation is waging a seemingly endless imperialist war against the Earth Kingdom and the Water Tribes, following the genocide of the Air Nomads one hundred years ago. Aang, the current Avatar, must master the four elements (Air, Water, Earth, and Fire) to end the war. Along the way, Aang and his friends are chased by various pursuers: the banished Fire Nation Prince Zuko, along with his uncle and former general Iroh, and Admiral Zhao of the Fire Navy. Each episode of the season attracted more than a million viewers on its first airing. Between January 31 and September 19, 2006, five DVD sets were released in the United States, each containing four episodes from the season. On September 12, 2006, Nickelodeon also released the "Complete Book 1 Collection Box Set", which contained all of the episodes in the season as well as a special features disc. The original releases were encoded in Region 1, a DVD type that plays only in North American DVD players. From 2007 to 2009, Nickelodeon released Region 2 DVDs, which can play in Europe