Team Avatar find themselves up to their necks in trouble as mysterious forces threaten to destroy land once sacred to the Airbenders! While Aang journeys to the spirit world in search of clues, Toph faces off against her own past!
Cryptic visits from the spirit of Avatar Yangchen herself lead Aang to discover a jointly owned Fire Nation and Earth Kingdom refinery-operating on land sacred to the Airbenders! Is this the cause of the pollution Aang finds there, or is a more mysterious
