In a world in which some people can telekinetically control one of the four classical elements, the Avatar is the only individual who can 'bend' all four elements and is responsible for maintaining balance in the world. Ordered in early 2011, Book Two: Spirits began airing on Nickelodeon in the U.S. It focuses more on spiritual concepts and themes than the preceding season, Book One: Air. It consists of fourteen episodes ('chapters').

It was initially conceived as a miniseries of 12 episodes, but it is now set to run for 52 episodes separated into four seasons, each of which tells a separate story.Book Two: Spirits is the second season of the animated TV series The Legend of Korra by Michael Dante DiMartino and Bryan Konietzko.

The series was praised by reviewers for its high production values and for addressing difficult sociopolitical issues such as social unrest and terrorism. It obtained the highest audience total for an animated series in the United States in 2012. The series, whose style is strongly influenced by Japanese animation, has been a critical and commercial success. The series follows Avatar Korra, the successor of Aang from the previous series, as she faces political and spiritual unrest in a modernizing world. Only one person, the 'Avatar', can bend all four elements, and is responsible for maintaining balance in the world. The series is set in a fictional universe where some people can manipulate, or 'bend', the elements of water, earth, fire, or air. Several people involved with creating Avatar, including designer Joaquim Dos Santos and composers Jeremy Zuckerman and Benjamin Wynn, returned to work on The Legend of Korra. It was created by Bryan Konietzko and Michael Dante DiMartino as a sequel to their series Avatar: The Last Airbender, which aired on Nickelodeon from 2005 to 2008. The Legend of Korra is an American animated television series that premiered on the Nickelodeon television network in 2012.

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