Well, obviously the greatest Science Fiction TV series was The Clangers - Iron Chicken, Soup Dragon and all.
But I doubt that ever made it across the Atlantic.
Pesonally I like all the Star Trek incarnations, more especially the Next Generation and Deep Space Nine. Rubbish a lot of the time, but enjoyable rubbish, and just occasionally a lot more than rubbish. And I'll watch the new one too.
Edmund Hamilton's Star Kings - yes I remember that Don - great stuff.