- "The time of humanity on this world has come to an end. The long night is starting. The age of the undead is upon us."
to be added
- The Doctor is bitten by vampire Nyssa.
- The Doctor is a contributor to the Wisden cricket magazine.
- Romana's rise to Lady President of Gallifrey begins.
- The Doctor and Ruath were classmates at Prydonian Academy on Gallifrey with Mortimus.
- Tegan Jovanka is still recovering from her second possession by the Mara.
- Tegan possesses the strength of faith to ward off vampires.
- In the original cover artwork for the novel, there was much more blood on Nyssa's clothes. This was considered too graphic a cover image by W H Smith, the UK's largest book retailer, so the image was altered to be less graphic before publication.
- The plot for the novel was originally developed from an unproduced comic strip for Doctor Who Magazine, which would have featured the Fourth Doctor in a fight against Dracula. Cornell later revised the story to use the Fifth Doctor for this novel.
- Paul Cornell once called the experiencing of writing this novel "most unpleasant", but did not elaborate.
- This is a sequel to NA: Blood Harvest.
- Following Adric's death, the Doctor swears that he will not allow another of his companions to die during his current incarnation. (DW: Earthshock)
- Tracking the journeys of the Fifth Doctor, Ruath notes that he has travelled to a deserted planet (DW: Castrovalva), Monarch's ship in deep space (DW: Four to Doomsday), Deva Loka (DW: Kinda), Earth on several occasions (DW: The Visitation, DW: Black Orchid, DW: Earthshock, DW: Time-Flight, DW: Arc of Infinity, BFA: Hexagora, MA: The Sands of Time), Gallifrey (DW: Arc of Infinity) and Manussa (DW: Snakedance).
- Ruath sees a point in the future where Gallifrey does not exist. (EDA: The Ancestor Cell, DW: The End of the World)
- The Discontinuity Guide to: Goth Opera at The Whoniverse
- Doctor Who Bewildering Reference Guide to Goth Opera