Fire promises to be the most exciting season yet! Aang wakes up from his battle with Azula to discover that Ba Sing Se has fallen and the world thinks he's dead. So he and his friends set off undercover to find Firelord Ozai before the Day of Black Sun.
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 comes to 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.
Aang and Zuko are taken on parallel adventures that give them insight into their forefathers' pasts - but how does the tale of Roku and Sozin matter to them now?
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.
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.
With the day of the eclipse upon them, the kids -- along with a rag-tag force of old friends -- enact their long-planned invasion of the Fire Nation.
As the invasion force fights their way to the Fire Nation capital, the kids help Aang to find the Fire Lord in time for the eclipse. But there are a few surprises. Zuko confronts his father and tells him that he's going to join the Avatar.
When our gang regroups at the Western Air temple, they find someone there they weren't expecting.
When it comes time for Zuko to teach Aang Firebending, it turns out Aang is not the only one who needs a lesson. The two set out to learn the true meaning of Firebending from the original teachers.
Sokka and Zuko head to the Fire Nation's most heavily guarded prison -- the Boiling Rock -- in hopes to find and break-out the captured invasion force. Sokka and Zuko have to rethink their escape plan after things go wrong.
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 to happy with her two closest friends.
Katara sets out to confront the Fire Nation soldier who killed her mother. But what will she do when she finds him?
The kids see a play about themselves and all their past adventures. But they aren't happy with the production.
In the climatic series finale, Zuko confronts Azula, and Aang finally faces the Firelord.
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. After the tracker is unable to track Aang, the rest of the group decide they must find Iroh. Meanwhile, while tracking down Iroh, the group meets up with The Order of the White Lotus, a group that transcends the division of the four nations. After a discussion with Iroh the team decides to split up: Sokka, Suki, and Toph head to stop the Fire Nation's air fleet, the masters head to reclaim Ba Sing Se, and Katara, Zuko, and Appa head to defeat Azula.
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. On the verge of losing, Aang gets hit in the back of his scar which sends him into the Avatar State.
Aang defeats the Fire Lord by bending the elements within the Fire Lord and removing his fire bending abilities. After Zuko is taken down protecting Katara from Azula, Katara fights and manages to restrain Azula. Afterwards, Zuko is crowned Fire Lord and promises a better future for the world. Aang takes his place as the next Avatar, changing his attire in the process. Katara finally shows her love for Aang as they kiss in the last scene.