While Aang, Katara and Sokka are traveling, Sokka gets a fever. Katara and Aang try to help Sokka, when only Katara 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.Will Aang save Sokka and Katara in time?And who is this strange figure wearing a blue demonic looking mask?