It’s been more than a year since a new episode of The Legend of Korra was shown on Nick, but thanks to this year’s Comic-Con, fans finally have a taste of the show’s next season. Comic Book Movie has the brand new trailer for Book II: Spirits which was shown at San Diego earlier today, where it was also revealed that the new season  will begin in September. The Avatar: The Last Airbender spin-off made its debut last year to both rave reviews and strong ratings.