Best Buy has included a description of the season 1 set on their site:
With the 12 colonies of man virtually destroyed in the climax of a hundred-year war with the Cylon Empire, President Roslin (Mary McDonnell) and Commander Adama (Edward James Olmos) gather up the few humans left on the twelve worlds and embark on a journey to find the mythical planet Earth, the supposed thirteenth colony of mankind, not realizing that the Cylon robot is no longer a recognizable enemy... it can move among man. Edgier and racier than its predecessor, Battlestar Galactica is a complete re-imagining of the 1970s series - upping the ante on the action, adventure, and drama that made the original so popular. Battlestar Galactica Season One is the season aired on SkyOne in the UK featuring a different opening than the United States. Previously only available on DVD in the UK, this four disc set includes all 13 episodes plus deleted scenes. These DVDs have been formatted to be compatible with most North American DVD players.