After Zuko decides to travel alone he stumbles into a town overrun with rogue earth nations soldiers. After befriending a family of paupers and reflecting on his past, Zuko decides to defend the people he has come to love only to be banished again.
I believe this episode was necessary so that we can all understand that no all antagonists are pure evil. They all have their reasons for doing what they do and being they way they are. It is also important to make Zuko human to the viewers who see him as the meany who picks on Aang every week. This episode could foreshadow that Zuko will never fit in wherever he goes and whoever he befirends or it might just be away to replace him with another bad guy, the fire naion lord.
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