Extras on the six-disc set include commentary for three episodes: "In the Beginning," with executive producer Eric Kripke and writer Jeremy Carver; "When the Levee Breaks," with director Robert Singer and writer Sara Gamble; and "Lucifer Rising" with Kripke. Extended scenes are also available for several episodes, and the features are rounded out by a trio of somewhat ponderous featurettes on the concepts of Heaven, Purgatory, and Hell, as depicted in scenes from the show and discussed by its writers, theologians, paranormal investigators, and the like. Clocking in between 10 and 25 minutes apiece, the docs feel padded and somewhat undernourished in the information department. However, they're unlikely to detract from one's enjoyment of this stellar season. --Paul Gaita