Creator Joe Ahearne never intended to write and direct all six episodes. While the producers commissioned scripts from other writers, they ultimately felt that no other writers or directors understood Ahearn's vision as well as he. The result was that Ahearn's time was consumed with the development of the first series, and he was never able to outline a second arc. Ahearn also admits that he believes high-concept series are best kept short, so that they don't run out of steam and have to be re-invented.
Susannah Harker, who plays a vampire hunter here, is in reality a descendant of Jonathon Harker, a friend of Bram Stoker, and who was immortalized in Stoker's novel "Dracula."
The word 'vampire' is never used in the series. Instead, the characters refer to them officially as Code 5's (5 in Roman numerals is 'V'), or unofficially as 'leeches.'
In 2000, the American Fox network developed a version of Ultraviolet, starring Eric Thal, Joanna Going and Mädchen Amick with Idris Elba reprising his role from the British series. The American version did not progress beyond an unaired pilot episode. Howard Gordon, one of the producers contracted to develop the series, said in an interview that "we screwed it up and it just didn't come out that well."