It has been a year since Korra defeated Amon and his Equalist army. However, her time of rest and relaxation is about to come to an end when she and her friends discover a portal which leads them to two different worlds; one a fantasy world ruled by sentient equines and creatures straight out of fairy tales and another where humans struggle for survival against gigantic beasts. However, Korra must form alliances if she is to stop a ruthless enemy whose eyes are set on conquering all three worlds.