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.
Episode 1 & 2