During an Avatar : The Last Airbender episode , titled `` The Tales of Ba Sing Se '' ( episode 15 of the second season ) , which comprises several small stories about the main characters , there is a segment titled , `` The Tale of Iroh . '' During an Avatar : The Last Airbender episode , titled `` The Tales of Ba Sing Se '' , which comprises several small stories about the main characters , there is a segment titled , `` The Tale of Iroh . ''