When does The Legend of Korra return?

The Legend of Korra is a sequel to their previous series Avatar: The Last Airbender. It ran for 52 episodes across four seasons ("books") from April 14, 2012, to December 19, 2014. The main characters are voiced by Janet Varney, Seychelle Gabriel, David Faustino, P. J. Byrne, Mindy Sterling, Aubrey Plaza, John Michael Higgins, Kiernan Shipka, Lisa Edelstein, Eva Marie Saint, Henry Rollins, Anne Heche, and Zelda Williams. 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 person, the "