Thrown together in the dungeon of BaSingSe, Katara convinces Zuko to teach Aang firebending. But the battle ends badly: Hakoda injured, Iroh behind bars. With limited time before the eclipse, and an Earth Kingdom army ready to tear the Fire Nation to shreds, Zuko begs Aang to spare his father's life. Yet things are not as they seem. Katara suspects Iroh knows more than he lets on.