just thought what sci fi shows people like if any?
whether it be joe 90 or thunderbirds or firefly or star trek 
my fave sci fi shows will always be top 3
1)star trek
2)battlestar galactica
3)firefly  
      Distinguish between old and new BG and Star Trek...
Top 3
1) Doctor Who
2) Blake Seven
3) Thunderbirds  
      I don`t really watch anything sci-fi these days but when I was young I quite liked
Blake Seven
Doctor Who - Tom Baker era
Space 1999 - it was the future
Star Trek
Joe 90  
      SGU! :thumbup:
And most of the Star Trek franchise.  
      x files
dark skies
star trek any  
      has to be 
Blakes 7
Torchwood (especially the early episodes)
Space1999
Star Trek
Suspect the answers to this post will define everyones age, the younger perhaps identifying the more modern shows (Star Trek spin offs etc), the older picking the classics from too many years ago.
With the exception of Torchwood I wouldn't really want to re-watch them, suspect I would be very disappointed by wobbly sets and wooden acting ! Just let them stay as memories.  
      Erm ...
Babylon 5
Lexx
Quantum Leap  
      Torchwood
Doctor Who
Battlestar Galactica
Star Trek films  
      and  more to the list, xmen the original series brilliant.
and silver surfer cartoon.  
      Blake's 7 - and Blake is STILL alive - he didn't die!!!!
Also Stargate - just for the possibilities it envisions. (And T'ealc)  
      and he does the voice over on jack fm  
      The number one would be Doctor Who, followed in no particular order by lost in space, original BG and Land of the giants.  
      Dr Who all the way for me
Red Dwarf springs to mind
And mustnt forget Blakes 7  :clap:  
      Tomorrow people, Bleep and booster. don't think I have seen any others  
      can you call the six million dollar man as sci-fi?
was ahead of its time in many ways and the intro just grabbed your attention.
and if i remember the ladies loved Lee Majors. and i had all the toys as a kid.
now that was a man! 
   
      In no particular order:
Doctor Who
Star Trek
Stargate and the spin off's  
      Re:- Mids... Prime ministers question time (about as scifi as you can get i reckon) 
Star trek voyager (Janeway phwooaarr yes please)
Tripods