Well, I've been giving it some thought, and I've come up with the following list of my own. It's very hard to stop at 25 actually, there are a good few that I would want to include but the others just edge them out. A top 50 might have been good for me. Ah well... There are a few in here that are borderline sf for me, but made it in here due to their sheer quality and enough sci-fi elements to be worth counting.) Oh yes, and I've only compiled my list from series, so not including any one-off plays, tv movies or individual serials.
1. Doctor Who (all of it - 1963 to the end of time probably...)
2. Blakes 7
3. Sapphire and Steel
4. Space: 1999 (should have been higher if season 2 wasn't there to drag it down...)
5. UFO
6. Babylon 5
7. Star Trek
8. The Prisoner
9. Timeslip
10. Quatermass
11. The Twilight Zone (original)
12. Farscape
13. Star Cops
14. Star Trek Deep Space Nine
15. Space Patrol
16. Captain Scarlet and the Mysterons
17. Star Trek The Next Generation
18. Thunderbirds
19. Survivors (original)
20. Alien Nation
21. Battlestar Galactica (original)
22. The Incredible Hulk
23. The Invaders
24. Clangers (original)
25. The Outer Limits (original)
I loved the Prisoner, but is it really science fiction?
In terms of watching and enjoyment, I still have a soft spot for the original BSG. Nostalgia perhaps, as that sticks in the mind of a 9-10 year old quite a bit, but I honestly can't say it's better than any of the shows on my list.
Loved the Invaders, but it seems dated now.
Alien Nation was good but for some reason, it doesn't really stick in the forefront of my mind.
UFO was fun but I can't say it was a good show really. Most of it made no sense at all.
The main reason I included mini-series is because the format for TV shows is different outside of the US, and I had to consider good shows that didn't run a typical 20-30 epiosdes as American TV has for most of it's span.
Random stuff:
As someone who reported on Humans, I have to admit I haven't seen it yet.
Angel isn't science fiction.
Evil Dead isn't science fiction.
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