Complete story — includes the ending
Sokka suffers from an illness due to his exposure to the elements during the storm. When Katara contracts the illness as well, Aang goes to a nearby herbalist institute in hopes of finding a cure. On his way to collect the remedy (frozen wood frogs for Katara and Sokka to suck on) Aang is captured by the Yu Yan archers, commanded by the newly-promoted Admiral Zhao. However, a sword-wielding masked marauder, the "Blue Spirit", rescues Aang from Zhao's compound. The Blue Spirit is knocked unconscious during the escape, and is revealed to be Zuko. Aang saves him and wonders if they could've been friends before the war. Aang flees when he is violently rebuffed. Zuko sulks back to his ship while Aang successfully cures Katara and Sokka.
Sources and content license
Source and revision history · Adapted from Wikipedia contributors, Avatar: The Last Airbender season 1. HTML formatting and reference markers removed. · Content license