Episode 4, "The Vampire" is a bit of a reworking from the first pilot movie for the yet unsold series "The Night Stalker". Like this pilot movie, much of the show is set in the Las Vegas area.
Kolchak picks up a lead on some murders that seem almost like what you'd expect from a vampire! However, he knows Vincenzo won't send him off to Vegas to investigate so he manipulates his boss into sending him to Los Angeles to cover the the upcoming wedding of some guru! Now where the film goes next sure sounds like the plot to a porno film, as Kolchak's investigation leads him to believe that there is a vampire-hooker who drains her clients! As I said, this sure sounds like porno, and I am pretty sure there are some films with similar themes! Regardless, as usual, cops not only don't believe him but actively get in the way of Kolchak's investigations. And so, as usual, he's forced to deal with the monster himself.
If you are looking for original, this episode has very little that varies from the usual "Kolchak" formula. Still, it's mildly interesting and his way to rid the world of this vampire is unique!