The season finale of a TV show like the animated fantasy "The Legend of Korra" can be bittersweet for fans. It's great to see burning questions answered, but it's a bummer to have to suffer the long wait for the next season. Followers of more adult-oriented fare like "Girls," "Game of Thrones," and "Mad Men" know this feeling all too well.

To preview the season finale of "The Legend of Korra," and provide some solace to fans by giving them a peek at the future of the show, the Journal spoke to "Korra" creators Michael Dante...