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Season 1 - Feb. 21, 2005
Season 2 - Mar. 17, 2006
Season 3 - Sep. 21, 2007

Avatar: The Last Airbender Season 1 Episode 2
HD
Overview:
Katara and Sokka discover that Aang is the long-lost Avatar and must rescue him when a Firebending prince named Zuko kidnaps him.