Legends is an American crime drama television series which premiered on TNT. The series was developed by Howard Gordon, Jeffrey Nachmanoff, and Mark Bomback, and is based on the book Legends: A Novel of Dissimulation written by Robert Littell. The series premiered on August 13, 2014. On December 4, 2014, TNT renewed Legends for a 10-episode second season, slated to air in 2015.