Due to be crowned King of the Netherworld by his mentor Merlin the Magician, Count Downe — son of Dracula — falls in love with beautiful mortal Amber and finds himself in conflict with Baron Frankenstein, who is vying for the same honourary title.

The police and British security forces call in Professor Van Helsing to help them investigate Satanic ritual which has been occurring in a large country house, and which has been attended by a government minister, an eminent scientist and secret service chief. The owner of the house is a mysterious property tycoon who is found to be behind a sinister plot involving a deadly plague. It is in fact Dracula who, sick of his interminable existence, has decided that he must end it all in the only possible way- by destroying every last potential victim.