Essa descrição se encaixa no enredo da série Channel 4 de 1998, Ultraviolet .
De Wikipedia :
The final episode reveals that the vampires' plan does not involve enslaving humanity as suspected. Instead, they plan to cause a nuclear winter, providing long-lasting darkness, and completely wiping out the threat of humanity with an engineered plague. Scientific advances made during their experiments will allow them to survive on synthetic blood and reproduce via live birth, eliminating the need for human victims.
A escrita é creditada a Joe Ahearne