The planet is separated into four primary nations that align with the four fundamental elements: water, earth, fire, and air. The northern and southern water tribes, the earth kingdom, the fire nation, and the air nomads each possess unique talents and abilities that are tied to their respective elements. To ensure harmony between these factions, the Avatar is tasked with maintaining order and stability. However, this balance was disrupted when the Fire Nation launched an invasion. The only hope for salvation is the Avatar, who possesses mastery over all four elements. Unfortunately, the Avatar mysteriously vanishes when the world needs them the most. One hundred years later, Katara and Sokka come across the next Avatar, a young airbender named Aang. Together, they must help Aang hone his skills in all the elements and unify the nations to save the world from destruction.