It's been twelve years since Avatar Aang and the infamous Team Avatar defeated the ruthless Fire Nation and ended the Hundred-Year War, and everything has changed for the better. Aang and Fire Lord Zuko founded Republic City, the Capitol of the United Republic of Nations. Toph has become chief of police, and Zuko returned the Fire Nation, where he plans to rule his homeland the way his father, Ozai, never did. Everyone believes that their trials and tribulations are over, but they'll soon come to realize that they're very much wrong. A new foe has emerged from the shadows, and he has his eyes on one person....Katara.