Avatar Book 1 Water Episode 13 - The Blue Spirit Episode Title:The Blue Spirit.Episode Description:Sokka suffers from an illness due to his exposure to the elements during the storm. When Katara begins to contract the illness as well, Aang goes to a nearby herbalist institute in hopes of finding a cure for his friends. On his way to collect the remedy the herbalist recommends (frozen frogs the afflicted are to stick in their mouths), Aang is kidnapped by a group of Fire Nation Yuu Yan archers, commanded by the newly promoted Admiral Zhao. However, a masked marauder rescues Aang from Zhao. The "Blue Spirit" is knocked unconscious during the escape, and Aang discovers that he is Prince Zuko. Aang offers him friendship, but departs when he is violently rebuffed.