First thing - if you have the full boxset of this classic 70s series, save your money as its a double episode put together for a tv movie.
I for one prefer the original Battlestar Galactica. The new one gets too embroiled in politics and internal power struggles - it feels like a court room drama every episode! - , when all you want from a scifi series is space ships, lasers and nasty bad guys getting blown to bits!
By todays standards the effects are sub standard but they were ground breaking 30 years ago! Each episode cost $1 million to make! Thats a huge budget for a tv series with no modern CGI to fall back on!
Anyway, The Galactica is running out of fuel, things for the 400 hundred ships of survivors of the human race are looking grim. THEN the presumed destroyed Battlestar Pegasus with the legendary commander Caine appears out of nowhere.....
The acting is great, Dirk Benedict as Starbuck is unforgettable as the loveable rogue womaniser. Lorne Greene excels in the role of Commander Adama, and Lloyd Bridges is just superb as Caine.
If you like your scifi to be just that, Scifi, without worrying about ensuring all the physics work, buy the original Battlestar Galactica films or series. Its 30 years on and still just does the business!