Sacred Land Defiled! Avatar Aang asks his friends to help him honor Yangchen's Festival—one of the highest Air Nomad holidays, which hasn't been celebrated in over one hundred years. But 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 simply a case of corporate greed or is something more mysterious happening?

The Past Returns! Avatar Aang and his friends seek answers to the mysteries surrounding a refinery on land sacred to the Air Nomads. As Toph discovers a startling truth about her father's involvement with the refinery, Aang travels to the spirit world, discovering a secret as surprising as it is dangerous. Soon, Team Avatar realizes that they may be facing a threat more dire than they could possibly have imagined!

The spirits are restless! As Avatar Aang and his friends confront an ancient spirit determined to destroy a town on land sacred to Air Nomads, Toph and Aang find themselves on opposing sides in a battle of gigantic proportions. If Toph and Aang don't put aside their differences, there's more at stake than just their friendship!

Avatar Aang asks his friends to help him honor Yangchen's Festival—one of the highest Air Nomad holidays, which hasn't been celebrated in over one hundred years. But 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 simply a case of corporate greed or is something more mysterious happening?