Battlestar galactica is one of my favorite Tv series ever
I'm not sure I have watched it. What's it about?
Battlestar Galactica is an American science fiction media franchise that was created by Glen 
I like science fiction, so it sounds like it might be interesting. I have also heard from other people it's a good show. Any famous actors in it?
The series features Edward James Olmos and Mary McDonnell, yes i have heard from a lot of critics that is a very original series.
Is there a main plot to the series? It may be something I start to watch.
1970s programme takes a decidedly darker tone as what's left of humankind struggles for survival against the robot Cylons.
I do enjoy shows of times when mankind has to struggle with keeping his humanity during dark times. Sounds pretty good!