After 100 years, the Avatar-spiritual master of the elements-has returned. The Four Nations (Water, Earth, Fire, and Air) have become unbalanced. The Fire Nation wants to rule the world, It's up to a 12-year-old Airbender named Aang to find a way to stop him. Join Aang, Katara, Sokka, Momo, and Appa as they head out on the adventure of a lifetime.