What's the final episode of AVATAR: THE LAST AIRBENDER?

The last one is 阿凡达 Aang. Aang finishes off the 火, 消防 lord, Sokka, Toph, and Suki finish off the Air ships, and Katara and Zuko get rid of Azula. The last scene is Katara and Aang on the Balcony 接吻 and sadly, that's the end, until November 2012, of Avatar. There is a new series, Legend of Korra. She is the new 阿凡达 after Aang and goes to find Aang and Katara's son, Tenzin, to learn Airbending. 你 can wiki the rest ok. So that's my answer for you! Enjoy!