Ultraviolet
No, not the crappy film starring Milla Jovovich that doesn't make any sense.
I'm referring to the well-written 1998 British miniseries. I just recently learned of it, and watched it over the past couple of days.
If you're gong to watch it, though, you'd better do it soon. According to Netflix they are going to pull it on December 1st, so there's only a few days left.