Avatar Book 3 Fire Episode 6 - The Avatar and the Fire Lord Episode Title:The Avatar and the Fire Lord.Episode Description:Through separate sources, Aang and Zuko both learn about the close childhood friendship of Avatar Roku and Firelord Sozin. Sozin suggested to Roku that the Fire Nation should control the destiny of the entire world to ensure universal prosperity. As Roku was the Avatar, he knew the importance of balance between all people and disagreed. When Sozin later conquered an Earth Kingdom colony, Roku defeated him in battle and threatened to kill him if he again tried to do anything that crossed that line. When Roku's island volcano erupted years later, Sozin came to help. But, at the last moment, when Roku was overcome by volcanic gases, Sozin realized that he could rule the world if he let Roku die, and he abandoned him. Roku then died from the lava and was reincarnated as Aang. In his prison cell, Iroh tells Zuko that as the great-grandson of both Roku and Sozin, he alone has the ability to resolve their endless conflict and restore order and peace to the world.