In 1974, professor Lorrimer Van Helsing (Peter Cushing), a descendant of the famous Abraham Van Helsing, is called by England's secret service to help investigate a strange and powerful billionare named D. D. Denham (Christopher Lee) who is behind a evil organization dealing with satanic rites and a plan to destroy life on Earth using a devastating killer virus. As the investigation goes on, Van Helsing starts to suspect that Denham is, in fact, the master of evil, Dracula.