1.) Supernatural
2.) Firefly
3.) Dollhouse
4.) Buffyverse (Hehe count it as one)
5.) Dark Angel

1.) Supernatural
2.) Firefly
3.) Buffy the Vampire Slayer
4.) Dollhouse
5.) Avatar: the Last Airbender (ok I know it's a cartoon but the story arc is actually really mature and it's supernatural- so there!)

1. Twin Peaks. (hey, it had UFOs and evil posessing spirits, so to me it counts!)
2. Buffy/Angel. Like tinkymel said, it's all one show.
3. Firefly.
4.American Gothic. Didn't even last a season and most people have never heard of it. Do yourself a favor and check it out. I think you can watch every episode for free at fancast.com.
5. The X-Files.

1. Buffy
2. Supernatural
3. The X Files
4. Firefly
5. Star Trek: TNG

1. Babylon 5
2. Lost
3. Heroes
4. Battlestar Galactica(Second Series)
5. Supernatural