Sure, Republic City is free of Amon and the Equalists thanks to Korra, but now it's been six months, and "she and her friends will face impossible new dangers," the promo reveals.
Korra -- the only one who can bend water, earth, fire, and now air -- is not sure she can handle all the responsibility. "Maybe I'm not ready to be the Avatar," she confesses. But her journey has just begun, and with benders under attack and the spirit world out of whack, it's her job to fix things.
And for the first time ever, the headstrong protagonist will venture into the parallel plane of the spirit world, where all the immortal, supernatural, and spiritual entities exist.
"The Legend of Korra" Book 2 premieres Friday, 9/13 at 7 PM on Nickelodeon.