Aang and the group meet an Earth Kingdom general who wants to use Aang's powerful "Avatar State" as a weapon to defeat the Fire Nation. But getting into the "Avatar state" on purpose is more difficult than Aang thinks.

On their way to Omashu, the kids meet a group of nomads who show them a short cut through the 'cave of two lovers'.

The kids return to Omashu so that Aang can learn Earthbending from King Bumi. But when they get there, they are shocked to find the city is now in Fire Nation hands. Despite the danger, Aang enters Omashu in search of King Bumi.

When the kids end up in a mysterious and strange swamp, their fears are exposed. And Aang learns about being "connected to the Earth" from an unlikely teacher.

Aang must clear up a wave of anti-Avatar sentiment and atone for something he did in the past.

In search for an Earthbending teacher for Aang, the kids go to an underground Earthbending tournament where they encounter Toph, a blind, but powerful Earthbender.

Traveling without Uncle now, Zuko wanders alone into an Earth Kingdom town where he bonds with a local boy. Meanwhile, Zuko is haunted by memories of his own youth.

As the kids are pursued relentlessly by a mysterious machine, their exhaustion puts them at each other's throats.

When Aang struggles with a block while trying to learn Earthbending from Toph, he wonders if the problem is with him or his teacher. Meanwhile, Sokka gets himself in a jam.

A professor leads the kids to a spirit library in the middle of the desert, where Sokka hopes to discover powerful secrets to use against the Fire Nation.

Aang searches for Appa, while Katara struggles to keep everyone together so they can survive in the vast desert. Meanwhile, Uncle and Zuko seek help from an ancient secret society.

The group then huddles around the map to discuss in which direction they should go – the Serpent's Pass appears to be the most direct route.

Aang discovers a secret Fire Nation super weapon heading straight for Ba Sing Se and must stop it before it destroys the great wall that protects the city from invasion.

Aang and the kids finally arrive in Ba Sing Se to see the Earth King, only to find mysterious forces within the city conspiring to stop them. Meanwhile, Jet tries to find proof that Zuko and Uncle are Fire Nation.

A series of short stories, highlighting different characters and their individual adventures in the city. Tales of Katara and Toph, Uncle, Sokka, Aang, Zuko, and Momo.

In this special episode, we go back in time to the moment Appa was stolen, and find out exactly what happened to him, and where's he's been all this time - and where he is now!

While searching for Appa, the kids run into Jet, but are torn about whether to trust him or not. Meanwhile, Zuko also hunts for Appa.

The kids battle Long Feng the Dai Li when they attempt to show the Earth King the vast conspiracy taking place in his city. Zuko becomes seriously ill and has feverish dreams as he faces a spiritual crisis.