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Based on the hugely successful Nickelodeon animated TV series, the live-action feature film is set in a world where human civilization is divided into four nations: Water, Earth, Air and Fire.

The Fire Nation is waging a ruthless, oppressive war against the other three nations. The film's hero, the reluctant young Aang, is the "Last Airbender" -- the Avatar who, according to prophecy, has the ability to manipulate all of the elements and bring all the nations together. Aided by a protective teenage Waterbender named Katara and her bull-headed brother Sokka, Aang proceeds on a perilous journey to restore balance to their war-torn world.