Chapter 42: The Crossroad Between Worlds, Part 2

With Ba Sing Se collapsing due to the manifestation of Wan Shi Tong's library into the city, the goals of Aang and his friends become all the more perilous with the arrival of another dangerous spirit, and the definitions of ally and enemy become blurred in the face of a greater threat. The worlds have been thrown into imbalance, and it is up to the Avatar to restore or raze them.