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

The last one is Avatar Aang. Aang finishes off the feu 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 s’embrasser and sadly, that's the end, until November 2012, of Avatar. There is a new series, Legend of Korra. She is the new Avatar after Aang and goes to find Aang and Katara's son, Tenzin, to learn Airbending. toi can wiki the rest ok. So that's my answer for you! Enjoy!