Vampire Science

In the days when the Time Lords were young, their war with the Vampires cost trillions of lives on countless worlds. Now the Vampires have been sighted again, in San Francisco. Some want to coexist with humans, using genetic engineering in a macabre experiment to find a new source of blood. But some would rather go out in a blaze of glory - and UNIT's attempts to contain them could provoke anot...