TNT has given a 10-episode second-season pickup to freshman drama series Legends. It means the new TNT dramas that debuted this past summer — The Last Ship, Murder In the First and Legends — all have been renewed for Season 2. The Howard Gordon-produced Legends had the smallest Live+Same Day premiere audience of the three, opening with 2.6 million viewers in August. But the David Semel-directed pilot had been available on multi-platforms for a week prior to its premiere. Ultimately, more than 8 million viewers watched the Legends premiere live, through DVRs, VOD, digital on-demand and a pair of Saturday encores. Over the entire season, Legends averaged 3.2 million viewers in Live+7. When viewing across multiple platforms is factored in, the show’s audience jumps to 6.5 million viewers.

TNT also has renewed Falling Skies (for a final season) and Major Crimes, while canceling Dallas, Perception and Franklin & Bash. Still pending is the renewal — likely for two seasons — of flagship TNT drama Rizzoli & Isles. Legends, as well as The Last Ship and the upcoming Librarians, are part of TNT’s push into genre fare that started with Falling Skies.

Based on the book by Robert Littell, Legends, from Fox 21, focuses on the work and life of Martin Odum (Sean Bean). An undercover agent for the FBI’s Deep Cover Operations division, Odum has the ability to develop a new identity for each assignment. I hear that there could be some supporting cast changes going into Season 2.