Avatar Aang, the world's last Airbender, learns of an ancient power that could save his culture from extinction. With the help of his friends, he embarks on a global quest to find it before it falls into the wrong hands and threatens to upend the peace they sacrificed everything to achieve.

A century has passed since the Fire Nation declared war on the other three nations of air, water, and earth in its attempt for global domination. Aang, the long-lost Avatar, is found by Water Tribe siblings Katara and Sokka and must learn to master water, earth, and fire bending to defeat the Fire Nation and restore balance to the world.