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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 1
HD
Overview:
Two teenage siblings (Sokka and Katara) living in the South Pole discover a very strange boy (Aang), along with his pet flying bison Appa, in an iceberg. But can they trust him when he accidentally draws the war to their village’s doorstep?