After getting tickets for the ferry headed to Ba Sing Se, the gang meets an old friend. They skip the ferry ride to help some refugees, one of which is going to have a baby, get to Ba Sing Se. They must lead the refugees through the Serpent's Pass, a dangerous mountain-side path surrounded by water.
After arriving at the great wall of Ba Sing Se, Aang and the gang discover that the Fire Nation has constructed a great drilling machine to penetrate the wall. The drill is also followed by an army of Fire Nation troops. Also, Zuko and Iroh are having trouble hiding the fact that they are both Firebenders.
Aang uns seine Freunde wollen mit der Fähre bequem nach Ba Sing Se reisen. Doch es kommt anders als geplant: Aang sieht, dass drei Flüchtlinge nicht an Bord gelassen werden. Er beschließt, sie auf dem Randweg zu begleiten. Ihre Route führt die Gruppe über den gefährlichen Schlangenpass, der zum Teil überflutet ist. Im Wasser lauert eine riesige Seeschlange auf nichts ahnende Reisende…
Dopo aver lasciato il deserto, il gruppo incontra fortuitamente Suki e le guerriere Kyoshi, e tenta di condurre una coppia attraverso il Passo del serpente, una strada pericolosa per le terre di Ba Sing Se, dove spera di trovare il suo bisonte volante perduto, Appa.
Deixando o deserto por Ba Sing Se, Suki e seus amigos guiam os refugiados do Reino da Terra por trilhas traiçoeiras nas montanhas. Zuko conhece um novo amigo, Jato. Nos muros de Ba Sing Se, a turma enfrenta o exército da Nação do Fogo, enquanto Jato começa a suspeitar de Zuko e Iroh, cujo disfarce pode ser descoberto.
