I don't watch much TV in general. Not because there's nothing good to watch, but because there's so damn much good TV nowadays that if I get involved I have to watch all of it, and I waste enough time as it is. Aside from Doctor Who, the last major SF series I followed was Firefly, and that didn't take long to watch all of. Before that, I watched all of Farscape, and Babylon 5. I collected Doctor Who, Firefly and Babylon 5 on DVD, but not Farscape. Then of course, there's Star Trek. I think Enterprise is the only Star Trek TV series where I didn't see all the episodes. The original series is the only one I have DVD of, but it's a good blu-ray set.