Book One: Water

Book 1: Water is the title of the first season of Avatar: The Last Airbender. The title refers to the Avatar Cycle: Water, Earth, Fire, and Air; also, the story of Aang learning Waterbending is primarily focused on during this season.

Book one contains the story of a 12-year-old Airbender named Aang, who is discovered frozen in an iceberg by two young Southern Water Tribe siblings, Katara and Sokka. They discover that he is the Avatar, the only person who can master all four bending disciplines and put an end to the devastating war started by the Fire Nation after the Avatar disappeared 100 years ago. The three kids journey to the Northern Water Tribe, where Aang and Katara can find a waterbending teacher. Throughout their journey, they are pursued by the banished Fire Nation Prince Zuko.

The season began on February 21, 2005, with the airing of The Boy in the Iceberg, and ended at twenty episodes on December 2 of that year, with The Siege of the North, Part 1 and The Siege of the North, Part 2 (both episodes aired on the same date).

The episodes were released on five DVDs (four episodes to a DVD), and then a box set containing all twenty episodes of the season. The DVDs were released throughout the year 2006.