At the South Pole, a lone water tribe village struggles to survive. Young waterbender Katara and her warrior brother Sokka rescue a mysterious boy named Aang, who is an airbender--a race of people no one has seen in a century. Soon, everyone discovers that Aang is the long-lost Avatar. Now it's up to Katara and Sokka to make sure that Aang faces his destiny: to save the world!