Watch Avatar the last airbender Book 2 Earth Episode 4 online and free episodes. Steram cartoon Chapter Avatar the last airbender Book 2 Earth Episode 4 The Swamp While flying over a swamp, Aang, Katara, Sokka, and Appa get separated by a tornado. In the swamp, the gang begins to see visions: Sokka of Princess Yue; Katara of her mother, Kaya; and Aang of an unknown girl. Meanwhile, Appa and Momo are captured by local Waterbenders, and are saved from being eaten near the end of the episode. At the very end, Zuko is seen as The Blue Spirit.