Justified 10 p.m., FX

Are you not watching this show, which returns for season four tonight? It’s among the best TV dramas, not least of all thanks to Timothy Olyphant’s cool performance as the Elmore Leonard-created US Marshal Raylan Givens. The show isn’t just about crime-solving; it’s about backwoods characters who are funny, desperate, and macabre. This season, a bunch of new characters show up as Raylan investigates a 30-year-old case. Among them: Patton Oswalt as Raylan’s very own Barney Fife. Pictured: Olyphant (left) and Oswalt.