Dr Hess Green [Duane Jones], anthropologist and geologist, is studying the Myrthian culture of Nigeria. Myrthians were human blood drinkers. Green gets a strange dagger from Myrthia and asks research assistant George Meda [Bill Gunn] to help him. When Meda stabs Green with the dagger (Why? "Oh, he's freaking out again"), Green doesn't die; he becomes immortal and needs to drink human blood. When Meda's wife [Marlene Clark] comes looking for Meda, she falls in love with Green. And when she finds her husband's body in Green's freezer, she marries Green!!!! Green makes Mrs. Meda immortal, then goes to a revivalist church to save himself. It's a screwy life being a Myrthian vampire, I guess.
Storyline
When two prominent black anthropologists, Dr. Green and Dr. Matara, uncover the remains of an ancient African tribe of bloodsuckers called the Myrthians they unleash an evil force buried for centuries beneath the earth. Matara, possessed by the spirit of the Myrthian queen, attacks his partner and then kills himself- leaving Hess to return to the U.S. with an unquenchable thirst for blood. After seducing Matara's widow, Green soon has her hooked on the red stuff as well. Together they lure innocent victims into their deadly trap, leaving a trail of drained bodies in their wake. The grisly murders go unsolved-that is, until the fateful day when Green stumbles into a Gospel meeting and all hell breaks loose. Dr. Hess Green, an archaeologist overseeing an excavation at the ancient civilization of Myrthia, is stabbed by his research assistant, who then commits suicide. When Hess wakes up, he finds that his wounds have healed, but he now has an insatiable thirst for blood, due to the knife carrying ancient germs. Soon after, Hess meets his former assistant's wife, Ganja. Though Ganja is initially concerned about her missing husband, she soon falls for Hess. Though they are initially happy together, Ganja will eventually learn the truth about Hess, and about her husband. Will she survive the revelation? Will Hess? — Jean-Marc Rocher