Avatar: The Last Airbender

Season 1, Episode 13

Episode Title: The Blue Spirit

Air Date: 2005-06-17

Overview:

While Aang, Katara and Sokka are traveling, Sokka gets a fever. Katara and Aang try to help Sokka, when Katara also catches the fever. It's up to Aang to go up on his own to save his two friends. But before he can get the medicine he is captured by the newly promoted Admiral Zhao and put in Zhao's fortress.