Michael DiMartino and Bryan Konietzko, the creators of "Avatar: the Last Airbender" are readying the next chapter in the animated saga, titled "The Last Airbender: Legend of Korra." The new series is due out mid-2012 on Nickelodeon.

"Avatar" and "Korra" take place in a setting that feels as richly imagined as Middle-earth, Narnia or Hogwarts. In this world, some inhabitants are "benders," each with the power to manipulate one of the elements--air, fire, earth or water--to their will. One person, the Avatar, has the ability...