Three elderly distinguished gentlemen are searching for some excitement in their boring borgoueis lives and gets in contact with one of count Dracula's servants. In a nightly ceremony they restore the count back to life. The three men killed Dracula's servant and as a revenge, the count makes sure that the gentlemen are killed one by one by their own sons.
When the TARDIS malfunctions, it and its travellers land on Earth at the size of insects. They uncover a murderous plot involving a new insecticide, but how can they stop the crime in their miniaturised condition?