Henry or Harry "Hal" Yorke is an English vampire who first appears in Series 4. His age and power are sufficient that he is considered an Old One, though at the time of his appearance he has forsworn any allegiance to his own kind. He is notable in that as a Vampire, he had two personas that he switched between every few decades in cycles; one kind and good natured, the other cruel, sadistic and evil. Following the Devil's apparent destruction, Hal's humanity was seemingly restored and thus his two personas were apparently either merged or replaced with a new one, although the Series 5 DVD scene has confirmed that the defeat of the Devil was in fact an illusion.