<Tr> <Th> 30 </Th> <Td> 10 </Td> <Td> "The Library" </Td> <Td> JM Animation </Td> <Td> Giancarlo Volpe </Td> <Td> John O'Bryan </Td> <Td> July 14, 2006 (2006 - 07 - 14) </Td> <Td> 210 </Td> </Tr> <Tr> <Td_colspan="8"> <P> Sokka decides the group needs some intelligence to defeat the Fire Lord . At an oasis, the group encounters a professor who tells them about a hidden Spirit Library in the desert . Inside, Sokka discovers a crucial weakness to the Fire Nation that could end the war: the date of the upcoming solar eclipse which will cripple the firebenders' firebending . The spirit of the library, Wan Shi Tong, refuses to allow them to leave with the knowledge and sinks the library into the sand . Meanwhile, Appa is kidnapped by Sandbenders . They all escape from the library but are devastated by the loss of Appa . </P> Note: That is Zhao's final official appearance in this series . He is shown in a clip from "The Siege of the North" at the beginning, recapping that Zhao found the library years ago . It is, however, a younger version due to the fact that he was a lieutenant at the time . </Td> </Tr> <P> Sokka decides the group needs some intelligence to defeat the Fire Lord . At an oasis, the group encounters a professor who tells them about a hidden Spirit Library in the desert . Inside, Sokka discovers a crucial weakness to the Fire Nation that could end the war: the date of the upcoming solar eclipse which will cripple the firebenders' firebending . The spirit of the library, Wan Shi Tong, refuses to allow them to leave with the knowledge and sinks the library into the sand . Meanwhile, Appa is kidnapped by Sandbenders . They all escape from the library but are devastated by the loss of Appa . </P> <Tr> <Th> 31 </Th> <Td> 11 </Td> <Td> "The Desert" </Td> <Td> DR Movie </Td> <Td> Lauren MacMullan </Td> <Td> Tim Hedrick </Td> <Td> July 14, 2006 (2006 - 07 - 14) </Td> <Td> 211 </Td> </Tr>

Avatar the last airbender episode 19 season 2