The fourth and final season of the reimagined science fiction television series Battlestar Galactica premiered on the Sci-Fi Channel in the United States on April 4, 2008, and concluded on March 20, 2009.

[22] The season received universal acclaim from critics, scoring 85 out of 100 based on 16 reviews from Metacritic.

The website's critical consensus reads, "Battlestar Galactica's final season proves a satisfying conclusion to TV's best science fiction offering.

"[24] The series also placed on numerous critics top ten lists of both 2008 and 2009 by publications such as the Chicago Tribune, San Francisco Chronicle, The Star-Ledger, Time and TV Guide.

[30] For the 10 regular episodes, Battlestar Galactica averaged a 1.7 Nielsen household rating and 2.2 million total viewers.

Executive producer Ronald D. Moore and writer Michael Taylor provide commentary for the extended version.

Also included on the Razor disc are deleted scenes, two featurettes—"The Look of Battlestar Galactica" and "My Favorite Episode So Far", as well as a sneak peek at season 4.

Also included are deleted scenes for every episode, ten David Eick videoblogs, three featurettes—"The Journey", "Cylons: The Twelve", and "The Music of Battlestar Galactica", as well as a sneak peek of season 4.5 and a trailer for Caprica.

Also included are deleted scenes for various episodes, 11 David Eick videoblogs, and five featurettes—"Evolution of a Cue", "And They Have a Plan", "The Journey Ends: The Arrival", "What the Frak is Going on With Battlestar Galactica?