Book One: Water is the first season of Avatar: The Last Airbender, an American animated television series created by Michael Dante DiMartino and Bryan Konietzko and produced by Nickelodeon Animation Studio. The first season aired on Nickelodeon from February 21 to December 2, 2005, and consisted of 20 episodes. The series stars Zach Tyler Eisen, Mae Whitman, Jack DeSena, Dante Basco, Dee Bradley B... Wikipedia