The Doctor, Tegan, and Nyssa arrive on Gallifrey, as Cardinal Hemal sent a distress signal to the Doctor. Hemal tells the Doctor the matter is discreet, and Tegan and Nyssa follow the Doctor. Tegan feels ill with a cold, so she's given a tablet, and remains in the TARDIS. Hemal shows the Doctor and Nyssa a body in the morgue, with vampiric teeth marks, and drained of blood. The Doctor urges him to stake the body, before Gallifrey is overwhelmed with a Vampire plague.
The Doctor tells Nyssa of how dangerous Vampire genetic material is, before they overhear a scream. There, they find a cult who worships Rassilon as a Vampire in the middle of sacrificing a man. In her bedroon, Tegan is feeling better, before being set upon by Hemal, who reveals himself to be the Vampire. The Doctor and Nyssa discover that the cult found an ancient Vampire DNA sample, and one of their number stole it.
Back at the TARDIS, Nyssa and the Doctor discuss why anyone would think Rassilon was a secret Vampire, before Tegan walks into the control room. However, as she's infected, Tegan lunges at the Doctor, before he is able to talk her down. Hemal takes control of the TARDIS, and takes to another galaxy, revealing he had lured the Doctor so that he could transport the Vampire infection throughout time and space. With the first destination being London, Nyssa secretly resets the arrival parameters, so that the TARDIS lands in sunshine, killing Hemal, and freeing Tegan, although she doesn't remember anything. The Doctor assures Nyssa they have nothing to worry about, even though, in a graveyard, a cult is resurrecting a Vampire...
- References are made to the Eternal War.
to be added
- The final scene of a cult resurrecting a Vampire also appears in Goth Opera.