According to the series' creators, about half of Book Two will take place in Republic City and the other half will take place in other areas of the world. In a panel discussion at San Diego Comic-Con 2012, Konietzko and DiMartino indicated that Book Two will take place six months after the first twelve episodes. They said that it will partially take place at the South Pole, in the Southern Water Tribe, and focus on the mystical "Spirit World" (hence the title "Spirits") and the history of the Avatar lineage and mythology. New characters include Tenzin's older sister Kya, a waterbender; Tenzin's non-bender older brother Bumi; Korra's paternal uncle Unalaq; and her first cousins, Desna and Eska. Two episodes, Beginnings 1 and 2, will tell the story of Wan, a bender who becomes the first Avatar as a result of his attempts to balance the human and spirit worlds.
本作时间线设置在《降世神通:最后的气宗》本篇70年后,主角科拉(Korra)是继安昂之后的下一位女性神通,诞生于南方水族部落,性格热情叛逆,故事开始时她已掌握了水、火、土三种元素,接下来将在安昂与卡塔拉之子丹增(Tenzin)的指导下学习御气之术。故事的舞台固定于虚构的城市共和城(Republic City),这是一个由蒸汽朋克式技术提供能源的大都会,设计灵感糅合了上海(1920~1930)、香港以及曼哈顿、温哥华等城市的特征。在共和城,高发的犯罪与反御术运动都是科拉即将面对的难题。 共26集划分为Book One: Air (2012)和Book Two:Spirits (2013)两季播出,分别为12集和14集。