Having survived the terrible battle with Azula, Aang faces new challenges as he and his brave friends secretly enter the hearth Nation. Their quest is to seek out and defeat Firelord Ozai. Along the way, they discover that Ozai has plans of his own. The leader of the hearth Nation intends to use the huge power of Sozin’s comet to spread his dominion permanently across the four nations. Short on time, Aang features a lot of bending to find out and no master to assist him learn it. However, his friends are there to assist , and he finds unexpected allies deep within the heart of the hearth Nation. within the spectacular four-part conclusion, Aang must fulfill his destiny and become a totally realized Avatar, or watch the planet go up in smoke.