The Library
When Aang and his friends find a professor who knows of a library that contains information about the world, Sokka decides to go there to hopefully find some information to use against the Fire Nation. The library is guarded by the knowledge spirit, Wan Shi Tong, who unfortunately doesn't welcome humans into his library, because he believes they only seek information for evil purposes.
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More from this season
S2 E1
The Avatar State
Plagued with nightmares featuring the devastating power of his Avatar State, Aang and the gang meet an Earth Kingdom general who has big plans for defeating the Fire Nation. Meanwhile, Zuko and Iroh, having survived the failed attack on the North Water Tribe, have a surprise visit from Zuko's sister with seemingly good news.
S2 E2
The Cave of Two Lovers
On their way to Omashu, Aang, Katara, and Sokka meet a group of nomads who show them a shortcut through the "Cave of Two Lovers". But when the group becomes trapped in the cave, it's up to Aang and Katara to save the group by trusting in love, possibly questioning their relationship. Meanwhile, Iroh gets a lethal rash so Zuko and Iroh head to a small Earth Kingdom town for help, hoping their real identities will not be discovered.
S2 E3
Return to Omashu
Despite the shocking news the gang have just discovered, Aang insists on trying to find Bumi within Omashu's borders, even with the dangers that will await him and his friends if his real identity is discovered. Meanwhile Azula goes in search of old friends to help her with her mission.
S2 E4
The Swamp
A mysterious tornado pulls the kids into a supernatural swamp where Katara, Sokka and Aang have mysterious visions. Meanwhile, Momo and Appa are chased by rogue swamp dwellers and only Aang and the gang can save them.