The Southern Air Temple

This is episode 3 of Avatar: The Last Airbender

Aang, Katara, and Sokka arrive at Aang's home, The Southern Air Temple, located on top of the Patalla mountain range. Aang enters a sanctuary and sees statues of all the past Avatars, and recalls his past. Meanwhile, Prince Zuko goes to Commander Zhou's harbor to repair his ship, which leads to Commander Zhou finding out that the avatar is alive, and Prince Zuko challenging him to a fire duel. Back at the Southern Air Temple, Sokka and Aang chase a flying lemur until Aang finds the dead body of his old master, Monk Gyatso. Aang unleashes his rage through his Avatar spirit. This warns all the nations of the Avatar's return. Katara calms Aang and they continue on with their new lemur friend "Momo" in tow. Prince Zuko fights (then) Commander Zhao and defeats him.