Determined to learn earthbending, Aang works to free Bumi from prison. Zuko chafes at Iroh's plan to stay hidden. Azula receives a new assignment.

At a high-stakes earthbending match, Aang discovers the teacher he's been seeking. Painful memories emerge after Zuko befriends a farming family.

Aang and his friends must trade powers for parties and politics as they navigate the two-faced court of the Earth King.

Toph puts Aang's skills to the test. In the streets of Ba Sing Se, Sokka searches for a missing friend, while Katara lives a double life.

To uncover a mythic library that could hold the key to defeating the Fire Nation, the team is forced to ally with an old enemy.

When one of their own is captured, the team concocts a risky plan to reach the Earth King. An illness changes Zuko's perspective — and Iroh's.

Torn across the city as the Fire Nation closes in, the team must reunite to save Ba Sing Se — and Zuko must decide where his real loyalties lie.