I think nearly every episode of Night Stalker contains themes that are familiar to the X-Files audience. I don't want to wander too far off topic, but citing NS's "The Vampire" and X-Files' "3" as examples, they're both set in L.A. and feature lady vampires who use sex to attract their victims, and the finales involve fire.
Gee, Mary, you must've been reading my mind because I wanted to reply to this topic and it was right at the top of the listing. Anyhoo, the original "Night Stalker" is tomorrow's SciFi min-marathon and it includes "The Vampire" ep mentioned above. Also, "The Trevi Collection" with Lara Parker for anyone who still hasn't seen it.
Actually, here's the list:
KOLCHAK: THE NIGHT STALKER "Mr. R.I.N.G"
KOLCHAK: THE NIGHT STALKER "The Trevi Collection"
KOLCHAK: THE NIGHT STALKER "The Ripper"
KOLCHAK: THE NIGHT STALKER "The Knightly Murders"
KOLCHAK: THE NIGHT STALKER "Bad Medicine"
KOLCHAK: THE NIGHT STALKER "The Vampire"
KOLCHAK: THE NIGHT STALKER "Horror in the Heights"
KOLCHAK: THE NIGHT STALKER "The Youth Killer"
Check
http://www.scifi.com/schedulebot to determine the times in your area.
Thanks, K!