Their journey leads to Ba Sing Se, the capital of the Earth Kingdom, where they uncover a great internal government conspiracy. After finding important information concerning the war with the Fire Nation, Appa ends up kidnapped. In the second season, Aang and his friends Katara and Sokka are on a quest to find an Earthbending teacher which finishes when they recruit Toph Beifong.
The series starred Zach Tyler Eisen, Mae Whitman, Jack DeSena, Jessie Flower, Dante Basco, Dee Bradley Baker, Mako Iwamatsu and Grey DeLisle as the main character voices. Book Two: Earth is the second season of Avatar: The Last Airbender, an American animated television series created and produced by Michael Dante DiMartino and Bryan Konietzko for Nickelodeon.