Season 1, Episode 6 - "Imprisoned"
25 March, 2005
Aang, Katara, and Sokka camp at a small Earth Kingdom town where all the town's Earthbenders are enslaved by the Fire Nation. Katara accidentally gets an Earthbender, Haru, arrested; in her guilt, she tricks the Fire Nation into arresting her so that she can help to free the Earthbenders from the inside.
