Doctor Who
How can you have a list of supernatural shows and not have Doctor Who on it? I’ve been watching for years (my favorite Doctor is still David Tennant). You never know where the Doctor is going to take us. And part of the fun is when he regenerates and we get a new Doctor!
Each Doctor brings something different to the show. Some episodes are lighthearted, some scary (the library one. Or Blink. Just go watch Blink. Oh. My. Gawd.), some have you in tears within just a few minutes into it, but the one thing you will always get is a story that every little thing, however small, all circles back around. The details matter, because you discover that every episode of that series has one or more things or people connecting it. Sometimes for good. Sometimes for evil. But the Doctor always comes through in the end!
I could go on and on talking about my other favorites like The X-Files, Buffy, Warehouse 13, Fringe, Haven, Merlin, Hercules (even Xena), Torchwood and Highlander (I love Scotland. As if I would leave Highlander off).
The thing about paranormal/fantasy is that there are no boxes you have to stay in as a writer. You’re only confined to the limits of your imagination. For me, it’s not just being plunged into a world that looks normal but is far from it, but it’s also to see what the writers will come up with that’s new and different. From weapons to magic to creatures, I’ll always eagerly tune into a supernatural show.