Aang, along with Katara, Sokka, and their animal friends Appa and Momo, continues on his quest to fulfill his destiny. According to the Avatar cycle, the group must now enter the Earth Kingdom to search for a master Earthbender to teach Aang.
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.
On their way to Omashu, the kids become lost in the treacherous "Cave of Two Lovers."
Aang enters Omashu so he can learn Earthbending from King Bumi, but the city is in the hands of the Fire Nation!
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.
Aang discovers a possible Earthbending mentor at an underground tournament.
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.
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.
Aang and the group escort a group of refugees to Ba Sing Se through the deadly "Serpent's Pass." There they discover a monstrous plot by the Fire Nation that threatens the city!
Having made it to the outer wall of Ba Sing Se, the kids confront a Fire Nation army that is driving a massive Fire Nation drill, which poses an imminent threat to the last Earth Kingdom stronghold. Meanwhile, Zuko and Iroh make crucial mistakes which begin to attract Jet's suspicions.
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.
A series of short stories, highlighting different characters and their individual adventures in the city.
In this special episode, we go back in time to the moment Appa was stolen.
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.
A guru at the Eastern Air Temple helps Aang take the next step in his Avatar journey. Everyone races against time to stop Azula's sinister conquest of Ba Sing Se.
Everyone races against time to stop Azula's sinister plan. Zuko finds companionship in an unlikely source. Aang's destiny hangs in the balance - and so does Zuko's, as Iroh tells him "it is time to choose."