Faced with the culmination of Princess Katara's plans, the Avatar and his allies must fend off an assault fleet of water nation ships and soldiers, as well as ensure the crowds of innocent refugees make it into the city safely, with the aid of the warriors of Roku. Toph must contend with the unwilling guards of sanctuary gate, while Aang once again duels Katara, face-to-face.

Determined to reach the power behind the empty throne and deliver the news of the Lunar Eclipse, Aang and his friends finally arrive in Ba Sing Se...

Meanwhile, Princess Katara puts her plan into action, ready to strike the first blow against the so-called impenetrable city...

Princess Katara leads her crew to Ba Sing Se, determined to take the most efficient route- no matter what her brother has to say about the local legends.

Meanwhile, Aang and Azula have an important conversation.

While frantically searching for Zuko after his sudden disappearance at the hands of a badger-mole spirit, Aang and his friends stumble across a strange guru, who tells them much of the origins of the world, and of the Avatar.

Meanwhile, Sokka's training to master bloodbending continues, and Katara sets a dangerous opponent on the path of the Avatar...

Pursued by a trio of deadly masked assassins, Aang finds himself forced to confront the one person he feared meeting most in this world...

Meanwhile, Toph and Sokka try to intercept Aang's encounter with the Princess, forcing them to decide where their true loyalties lie 

Burdened by the knowledge of Jet's actions, Toph decides to make her own way- leaving the Freedom Fighters behind to remember her burried past and try to make a new future.

Meanwhile, a certain pair of royal waterbenders grow closer to reuniting...

In search of an earthbending teacher, the gang stumbles into an ambush Aang was all too familiar with, and a scenario he had hoped to avoid entirely plays out yet again.

Hackles still raised over the revelations at Omashu, Aang and his companions can't stop bickering- even over something as simple as flying over the tallest mountain in the world, or going around it. Unbeknownst to the party, their decision will bring them to an encounter with a strange tribe, one that promises great knowledge to any who complete their mysterious trials. What visions will beset the group, as they brush against the spirit world to further their goals.

Meanwhile, Princess Katara tracks down someone vital to her mission, determined to have only the best fighting by her side.

EDIT: this episode was released with an audio track out of order- we apologize for the confusion, and have fixed the error.