Book Two: Spirits is the second season of the animated TV series The Legend of Korra by Michael Dante DiMartino and Bryan Konietzko. It consists of fourteen episodes ("chapters"). It focuses more on spiritual concepts and themes than the preceding season, Book One: Air. Ordered in early 2011, Book Two: Spirits began airing on Nickelodeon in the U.S. on September 13, 2013.
Book Two takes place six months after Book One; its narrative is divided between Republic City (the primary setting of the first season) and other locations such as the Spirit World and the South Pole home of the Southern Water Tribe. Korra's uncle Unalaq, the chief of the Northern Water Tribe, seizes control of the Southern Water Tribe as part of a scheme to free Vaatu, an ancient dark spirit. The story follows Korra's friends' efforts to win support for the southern tribe in Republic City, and Korra's quest to foil Unalaq's plans while learning about spirits. A two-part episode entitled "Beginnings" delves into the history of the Avatar lineage. It tells the story of Wan, the young man who became the first Avatar as a result of his attempts to maintain balance between the material and spirit worlds, and to atone for empowering the dark spirit Vaatu.
After Studio Mir, which worked on the series' first season, initially declined to work on Book Two: Spirits, it was set to be completely animated by Japanese animation studio Pierrot. However, Mir's animation director Yoo Jae-myung said that because of problems with this arrangement, the series's producers asked Studio Mir to help step in and animate Book 2 as well, an offer they accepted to preserve their studio's reputation. He said that Studio Mir initially chose to focus on animating the less challenging The Boondocks rather than the second season of The Legend of Korra because of the exhaustion brought about by their work on the first season. Pierrot eventually animated episodes 1 through 6 and episode 9, while Studio Mir was responsible for episodes 7, 8, and 10 through 14.
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