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 bend their respective element and call themselves Waterbenders, Earthbenders, Airbenders, or Firebenders. Only the Avatar is the master of all four elements. His role is to maintain balance between the nations and preserve world order. One day, the Fire Nation's leader, the Fire Lord, unleashed war to subjugate the other nations. The responsibility for saving the world fell on the shoulders of a twelve-year-old boy, an Air Nomad named Aang, who learned that he is the Avatar. Aang sets out on a dangerous journey with his brave friends from the Water Tribe, Katara and her brother Sokka. He will have to master all four elements, go through many trials, overcome his fears, and defeat the Fire Lord to stop the war and restore balance to the world.