Dr. Black And Mr. Hyde (1975)

aka's: Dr. Black And Mr. White/The Watts Monster/Dr. Black And Mr. Hyde/Dr. Black And Mr. White

A black scientist (Bernie Casey) develops a formula to regenerate dying liver cells, but it has the unfortunate after-effect of turning him into an albino vampire with a mania for killing prostitutes. Also stars Rosalind Cash and with Marc Alaimo (aka: Gul Dukat in Star Trek: Deep Space Nine).