This episode is part of the Avatar Book Two - Earth
Avatar The Last Airbender Episode Guide ~ via Wiki
This episode starts during the events of “The Library” and shows Appa’s abduction and his various adventures over the next few weeks. These include performing in a Fire Nation circus, revisiting the former site of Wan Shi Tong’s library, fleeing a startled farmer, and fighting with a porcupine boar. Suki and her fellow warriors from Kyoshi Island help him recover from his injuries, then the group is also attacked. He flees to the Eastern Air Temple, where a mysterious guru provides him with aid on his search.