After a lapse of 100 years, the Avatar--spiritual master of the elements--has returned. And just in the nick of time. The Four Nations (Water, Earth, Fire and Air) have become unbalanced. The Fire Nation wants to rule the world, and its first conquest will be the Northern Water Tribe. It's up to a 12-year-old Airbender named Aang to find a way to stop it.

Now a master Waterbender, Aang leaves the Northern Water Tribe to continue his quest to master the next element, Earth. Along with Katara and Sokka, they visit new Earth Nation cities, encounter a slew of differnt Earth Kingdom citizens, and even reunite with a crazy old king. Benders have incredible powers to manipulate the elements around them. Only one can control all four elements. That person is the Avatar.