In a world where the four elements can be controlled by people known as Benders, the Fire Nation is waging a ruthless, oppressive war to control the other great nations. The only hope for stopping the brutal war led by the Firebenders rests on the shoulders of a reluctant young boy named Aang . The last known survivor of the peaceful Air Nomads and the Airbenders, Aang is the Avatar. The Avatar is the physical re-incarnation of the world spirit, with the power to manipulate all four elements and draw upon the power, knowledge, and experiences of the Avatar's previous incarnations. The Avatar is responsible for maintaining balance between the four nations of the world and the spirit world, hence keeping the balance of the world. Aided by a protective teenage Waterbender named Katara and her bull-headed brother Sokka, Aang begins a perilous journey to restore balance to their war-torn world.