The world is divided into four nations: the Water Tribes, the Earth Kingdom, the Air Nomads, and the Fire Nation. Representatives of each nation possess the ability to control their respective element and call themselves Waterbenders, Earthbenders, Airbenders, or Firebenders. Only the Avatar is the master of all four elements. Their role is to maintain balance among the nations and preserve the world order. One day, the leader of the Fire Nation, the Fire Lord, started a war in an attempt to conquer the other nations. The responsibility to save the world fell on the shoulders of a twelve-year-old Airbender named Aang, who discovered that he was the Avatar. Aang embarks on a dangerous journey with his brave friends from the Water Tribe, Katara and her brother Sokka. He must learn to master all the elements, overcome numerous challenges, conquer his fears, and defeat the Fire Lord to stop the war and restore balance in the world.