When they find out an Air Nomad holiday hasn't been properly celebrated for a century, Avatar Aang and his friends travel to a sacred land to change that. Once there, Aang receives a visit from Avatar Yangchen's spirit, who warns him that powerful and dangerous spirits are about to awake and cause havoc, unless a refinery operation on sacred Airbender land is stopped.

At head of title: Nickelodeon. "Created by Bryan Konietzko, Michael Dante DiMartino"--Preliminary page.