This show is great and I love this season's DVD box set. The gag reel is cool and you get to see some final words from one of the main cast members who was killed off during mid third season. If you have the previous seasons on DVD you will enjoy the special features on this DVD more. There are other special features such as the shows creators (and others) talking about how the future of Artificial Intelligence may look and how it relates to the show, the 2013 Comic-con Panel (only includes cast members: Caviezel, Shahi, Emerson, and Acker, [not Henson or Chapman who I enjoy seeing in interviews], and some of the creators), info. about how it is to work with Boker (who plays Bear on the show), comic book shots of various scenes in the show, and commentary by Emerson on episode Deus Ex Machina.