sentences:  All eight seasons have been released on DVD and on Blu-ray; box sets containing the first three seasons were released on August 18, 2009, on both DVD and Blu-ray.The show received multiple nominations for various awards, winning 19—including two Primetime Emmy Awards, two Golden Globe Awards, seven Satellite Awards, five Saturn Awards, one Screen Actors Guild Award, and one TCA Award—and was twice selected by the American Film Institute as one of the ten best television programs of the year in 2006 and 2007.Other nominations include PGA Awards, WGA Awards, and Peabody Awards.