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Water. Earth. Fire. Air.
In a war-torn world of elemental magic, a young boy reawakens to undertake a dangerous mystic quest to fulfill his destiny as the Avatar, and bring peace to the world.
After sustaining serious injuries at the end of season two, Aang awakens to find himself aboard a Fire Nation ship. Meanwhile, Zuko journeys home.
To better camouflage themselves as real Fire Nation citizens, the kids check out a Fire Nation school. Avatar dance special. Also, Zuko confronts Uncle.
When the gang arrives at a suffering fishing village, a mysterious spirit appears to help the villagers.
When Sokka feels he's not contributing enough to the group, he seeks out a mysterious master to teach him the ways of the sword.
Zuko, Azula, Mai, and Ty Lee go on vacation at Lo and Li's beach house, where they learn a lot about themselves and each other. Meanwhile, the kids face a new enemy.
The Avatar and The Firelord The world's power was split between the Earth, Fire, Water and Air nations. Only Aang could save it.
When Toph discovers a quick way to make cash, Katara disapproves, and the rift between them has disastrous consequences.
The kids investigate mysterious disappearances in a spooky town. Katara makes a special connection.
Nightmares and Daydreams On the eve of the eclipse, Aang's anxiety gets the better of him. His dreams become nightmares, and soon he can no longer tell dream from reality.
The day of the eclipse has arrived, and the invasion force gathers together to make last preparations. They infiltrate the island and the battle begins. Meanwhile, Aang searches for the Fire Lord.
As the invasion force fights their way to the Fire Nation capital, the kids help Aang find the Fire Lord in time for the eclipse. Zuko confronts his father with shocking news.
Aang and the group arrive at the Western Air Temple, with Zuko in pursuit. Zuko wishes to help the Avatar end the war by teaching him firebending.
While teaching Aang firebending, Zuko realizes that he has lost all his firebending skills. To regain his powers, Zuko and Aang must seek the original source of firebending within the ruins of a lost civilization.
Sokka wants to break his father out of jail and asks Zuko for information on Fire Nation prisons. Sokka and Zuko head for the Boiling Rock, a prison located in the middle of a volcano, to rescue Sokka's father.
Zuko and Sokka make new plans to break out of the prison with Suki, Sokka's father and some others while a shocking twist leaves Azula none too happy with her two closest friends.
Katara decides to confront the Fire Nation soldier responsible for her mother's death. Aang tries to talk her out of it, but she doesn't listen.
A play recounting the gang's adventures does not sit well with Aang and his friends, except for Toph who enjoys it very much. Meanwhile, Aang confesses his love to Katara, but the response is ambiguous.
Aang struggles to decide whether or not he has to kill the Fire Lord and, during the night, is drawn toward an island which disappears before morning. Zuko leads the rest of the group to the Earth Kingdom to meet a tracker whom they hope can find Aang. The Fire Lord crowns himself Phoenix King and Aang awakens on the island not knowing where he is.
While on the island, Aang seeks guidance from his past lives, but is not pleased with what he is told. The island, in fact, turns out to be a lion turtle from which Aang is given the guidance he had been seeking. Meanwhile, after the tracker is unable to track Aang, the rest of the group decide they must find Iroh. While tracking him down, the group meets up with The Order of the White Lotus, a group that transcends the division of the four nations.
Sokka, Suki, and Toph try to stop the Fire Nation's air fleet. Meanwhile, Zuko and Azula duel in an Agni Kai and Aang confronts the Fire Lord.
