When does The Legend of Korra return?

The Legend of Korra ran for 52 episodes, separated into four seasons, from April 14, 2012, to December 19, 2014. 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. The main characters are voiced by Janet Varney, Seychelle Gabriel, David Faustino, P. J. Byrne, J. K. Simmons and Mindy Sterling, and supporting voice actors include Aubrey Plaza, John Michael Higgins, Kiernan Shipka, Lisa Edelstein, Eva Marie Saint, Henry Rollins, Anne Heche, and Zelda Williams.