In Book One, Avatar Korra—a headstrong, rebellious, feisty young woman who continually challenges and breaks with tradition—sets out on her quest to become a fully realized Avatar, struggling ...

Then there was The Legend of Korra, which ran for four seasons from 2012 to 2014; this one followed Aang's successor, who got his powers when he died. Then the series lay quiet until last year ...

The Legend of Korra started its long run with "Welcome to Republic City", a pilot that changed the world of Avatar: The Last Airbender forever.