The Harmony Restoration Movement has failed, and the four nations are plunged back into war, forcing Aang and Fire Lord Zuko to attempt to mend the rift between them once and for all.
Aang and Katara work tirelessly to prevent a dispute between Fire Lord Zuko and Earth King Kuei that could plunge the world back into war, while Sokka helps Toph prepare her metalbending students agai
Following the war, Aang travels to a colony in the center of Earth Nation where friction between neighbors threatens the world's new peace, pitting the Avatar against one of his closest friends.
