Avatar: The Last Airbender season 2 ending explained: Who dies and how does it set up season 3?

Spoilers within for the Avatar: The Last Airbender season 2 ending and how it sets up season 3 ...
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10 times Avatar was way more mature than most kids' shows

Avatar: The Last Airbender may present as a kids' series, but more often than not, it was far more mature than the average ...