CBS' "Trailer" returned to the air on Sunday, with the midseason premiere featuring Colter Shaw, who is on the run after being framed for a crime he didn't commit. Executive producer and star Justin Hartley has been developing this storyline for quite some time. He believes it's a great storyline and a cool thing to do something different that we haven't done before. Hartley also discusses the maturation of the network procedural over three seasons and how to keep it consistent with the show's pacing and appeal to loyal audiences.