Like its predecessor, the series is set in a fictional universe where certain people can telekinetically manipulate, or "bend", one of the four elements: water, earth, fire, or air. Only one individual, the "Avatar", can bend all four elements, and is responsible for maintaining balance in the world. The series follows Avatar Korra, the successor and reincarnation of Aang from the previous series, as she faces political and spiritual unrest in a modernizing world.