The Vârkolak was an undead creature which fed on on the blood and flesh of living creatures — usually humans, but it also attacked animals. Ladies would often end up being sexually assaulted by Varkolaks, later giving birth to children by them.
The Vârkolak was invisible and hunted only at night. Far from being undetectable, it would leave footprints, and could be seen with infrared night vision goggles. Folklore had it that the child of a Vârkolak (called a Dhampir) could see it, and that such children frequently became Vampire Hunters.
Normal bullets could wound a Vârkolak; holiness or silver was not necessary. Killing a Vârkolak was accomplished the same way as most vampires: a wooden stake through the heart.
Vârkolak attacks were reported around Kosovo up through the 1950s, when the reports stopped due to Communist takeover of the area. After the fall of the Communist Bloc, the country was too disorganised and violent to notice any possible attacks.
In the early 21st century England had a fairly stable gang supplying illegal immigrants from China willing to dig up cockles from the beaches in South End. When Immigration cracked down on the Chinese labor, the gang moved to cheaper immigrants from Kosovo. However, the Kosovans decided they didn't need the Chinese gang, and imported a Vârkolak from their homeland to kill off the Chinese. Unfortunately the Vârkolak proved far more successful than expected, and killed off most of Kosovans as well.
UNIT sent Colonels Emily Chaudhry and Robert Dalton to South End to investigate the murders, while Kosovan vampire hunter (and self-styled son of a Vârkolak) Goran was hired by the Chinese to kill the creature. Chaudhry and Dalton succeeded in killing it, while Goran turned out to be a fraudster — though the Vârkolak was saying something about family before it was killed. (AUDIO: Snake Head)