The original Star Trek is still my favorite. As far as episodes go, two top faves are Balance of Terror, and The Space Seed. I also as a kid used to LOVE UFO, but I have not seen it in so long I cant remember any episodes. I did enjoy the pilot for the new Battlestar Galactica (much darker than the original series) and much of what was shown about the ship was closer to what was written in the original book. Unfortuanately I missed much of the series afterwards being sent away by Uncle Sam for 18 months, so when I came back i was completely lost...