I think that at the end of book 2 the gang should be split. so the gang goes to meet with the guru and some how iroh and zuko follow along. So there talking to the guru when hes about to tell aang something important when azula with soldiers attack. Zuko manages to grab aang, azula grabs the guru and katara and maybe a new fire nation charachter grabs iroh. zuko then manages to take aang to the fir nation capitol wear ozai is. Although he managed to capture the avatar ozai still despises Zuko and tells him to leave the fire nation never to come back. Zuko then finally coming to his senses realizes that his father is a bad person and that hes doing the wrong thing. So Zuko as blue spirit breaks aang out of his cell and escape the city. So the two would be on the run from the fire nation constently until they escape. This would give zuko and aangs realationship to devolp. Maybe they start to become freinds. This could also give aang a chance to start to learn some basic fire bending. So now Azula has taken katara and the guru to a fire nation prison. Katara is contetly upset about the situation while the guru some how manages to be optimistic saying the oportunity to escape will present itself. One day another prisoner is thrown in and it turns out its zukos mother little do the two know who she is. The three escape and the guru reveals he is an airbender and that the other airbenders are in exile disguised as simple people. For the majority they search for the airbenders. So when this whole stand off situation accured sokka and toph manged to escape with appa and momo. They all return to the southern water tribe (Which is starting to look more like a town). They find Master Paku and Sokkas father. Sokka explains the situation and they start to form an alliance with the earth kingdom to attempt to break out aang. obviously they dont know aang has already broken out. They then close to the end of season siege the fire nation on the day with the eclipse thinking its there best chance. Litle do they know ozai planned on this. He then maybe has the dragon of the west. (in which iroh was nicknamed after) pumble the army. The eclipse wouldent last super long and the fire nation army would then attack forcing the army to retreat. Now Iroh has been taken directly to the fire lord. Ozai showing a small bit of compasion spares his brother for now hoping to hold him as bait for zuko. This would give a chance for ozai to devolop as a charchter and maybe shed some light on why ozai became fire lord. There could also be an episode in which Iroh has flashbacks to his child years ( would be cool to see how ozai and iroh treated eachother when they were young) it could also show more on Lu tehn and iroh. In the end Iroh finally fed up with Ozai's acts confronts him at the end of the season. This would be a pretty could fight considering the tension between the two and the fact they are brothers. Ozai would win in the end and kill Iroh it would be a sad episode but would finally make zuko realize what his fathers like and decides to stay with aang. The guru could then be used as comic reief to replace Iroh's absence.

I know i left many things unclear but i think this post is already long enough. Leave your comments and feel free to give some ideas i might post up the same about what should happen in book four (If there even is one in which this wouldent work if there is only gunna be one more season) if you guys like this. Leave comments ideas and questions.?? posted this a few threads back but i fixed this one up a bit.