Strange antics, such as boarding up his windows, cause Melinda and Jim to question the sanity of their new neighbour. It isn't until Melinda sees a ghost attached to the neighbour that she realises he is not only being haunted, but that the ghost is trying to kill him. Upon confronting the ghost, Melinda learns that he is seeking revenge.
A traveller who can visit any place travels through history with various companions and battles against aliens and other evil beings.
The team searches for a 15-year-old prisoner, Malia Norton, who disappeared from a girls' detention centre after receiving a life-threatening note. The investigation uncovers that Malia was a smart `model resident' who was 13 months into an 18-month sentence for a drunken-driving accident that killed a classmate and crippled her sister's boyfriend.
As the Doctor stumbles upon the mind-bending truth about the Scaroth, last of the Jagaroth, can he prevent Romana and Duggan from falling into the Count's evil clutches?