After sustaining serious injuries at the end of season two, Aang awakens to find himself aboard a Fire Nation ship. Meanwhile, Zuko journeys home.

Mistaken for a Fire Nation School student, the disguised Aang is forced to enroll in a Fire nation school. Aang's hair helped to disguise him better with his head band.

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 to Lo and Li's beach house, where they learn much about themselves and each other.

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.

In a Halloween installment, the gang looks into strange disappearances in a spooky town. There, an old lady named Hama teaches Katara some secret Waterbending techniques.

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.

It is the Day of Black Sun and the group meets up with the invasion force."The day has finally arrived and Aang is ready to take on the Fire Lord.

The eclipse has started and the gang only has a few minutes to get into an underground bunker and find and defeat Ozai.

The gang leaves the Fire Nation, humbled and embarrassed by the failure of the invasion. They head to the Western Air Temple.

Aang is ready to start his firebending training. However, as Zuko attempts to teach him, he realizes he has lost all his firebending power.

Sokka and Zuko break into The Boiling Rock Prison, the Fire Nation's highest security prison, to rescue Hakoda. When they develope an escape plan after finding Hakoda not there, other prisoners get involved and ruin it.

Katara and Zuko journey together to find the man responsible for the death of Katara's mother, Kya, who was killed in a Southern Water Tribe raid.

The gang goes to the theater to see a play about themselves, but are not happy with the production and the inaccurate portrayals of themselves.

Aang finds out that Ozai plans to burn down the Earth Kingdom with an airship fleet. He disappears during the night, having sleepwalked onto a mysterious moving island.

The gang find Iroh with June's help. Iroh suggests that Zuko challenge Azula for the position of Fire Lord, with Katara to help. The others decide to intercept the airship fleet.

Sokka, Toph and Suki begin destroying the airship fleet. Aang duels Ozai, but is soon overwhelmed because of his reluctance to kill him.

Katara eventually defeats Azula by trapping her in ice, and heals Zuko. Sokka, Toph and Suki destroy the airship fleet.