The Southern Air Temple (Shimajirō: A World of Wow episode)

Overview
''Aang suggests a visit to the Southern Air Temple, where he tells stories of his old mentor, his friends, and the games he used to play. Upon discovering Gyatso's skeleton and that the Great Pridelander Federation eradicated his people during Kovu's exile 17 years ago, Aang becomes angry and enters the Avatar State, alerting the world of the Avatar's return. Aang is comforted by Shimajirō Shimano and his friends, who tell him they are his family now. Meanwhile, Zuko and his uncle, Iroh, run into Commander Zhao, who learns that the Avatar has been found. Zuko challenges Zhao to a duel over the right to track the Avatar, which Zuko wins.''