S1E4 · Book One: Water - Chapter Four: The Warriors of Kyoshi

Complete story — includes the ending

Looking for a short break from their travels, Aang brings the group to the Earth Kingdom's Kyoshi Island, where he seeks to ride Elephant Koi. However, the group are captured by the Kyoshi Warriors, a group of female warriors who protect the island. The trio are freed when Aang proves he is the Avatar, a reincarnation of Avatar Kyoshi, and he quickly gains popularity. His popularity, especially among the girls, goes to his head and creates a rift between him and Katara. Meanwhile, Sokka is embarrassed after being bested by girls in combat training, and strives to prove himself stronger than the Kyoshi Warriors. When he suffers further embarrassment, he swallows his pride and asks to be trained by their leader Suki, who agrees. Aang's desire for popularity soon puts himself and Katara at risk when he tries to ride an Unagi serpent, and he endangers the whole island when Zuko gets word of his location. Zuko attacks, but Aang, Katara, and Sokka manage to escape and draw the Fire Nation away. Aang uses the Unagi to extinguish the fires caused by the attack.