This episode is part of the Avatar Book Two - Earth
Avatar The Last Airbender Episode Guide ~ via Wiki
Aang starts to learn control of the Avatar State from Guru Pathik at the Eastern Air Temple. Sokka is reunited with his father. Toph teaches herself “metalbending” while Xin Fu and Master Yu are transporting Toph back to her parents. Katara and the generals plan the invasion of the Fire Nation. Later, she sees Zuko and Iroh running their tea shop. Suprised, she tells this to the “Kyoshi Warrior” who is actually Azula in disguise.