The Fifth Doctor encounters an enthusiastic fan who has found traces of the Doctor's various visits to Earth in his archives. Many of the visits are accompanied by a characteristic energy signature which the Doctor does not recognise and sets off to investigate. He travels to 1984 Baltimore, but hears a police report with a search out for the Doctor and realises a future incarnation is already there, so instead decides to visit Australia in 2006.
There he is to meet Tegan, an old companion, still trying to reconcile her everyday life with the adventures she had with the Doctor, and Katherine Chambers, a woman dealing with a legacy of events in the Doctor's future…
The story is set on Tegan's birthday, September 22.
Doctor Who actress and singer Billie Piper (Rose Tyler) shares that birthday, a fact subtly acknowledged by the story when it is mentioned during an in-story radio broadcast.
This was the first audio drama in the main Doctor Who range in which Janet Fielding (Tegan Jovanka) appears, although she has confirmed that she will be reprising the role of Tegan in more audios in the future. Fielding has since reprised her role as Tegan alongside Vislor Turlough and Nyssa since 2010.
The author Joseph Lidster features on the cover as a figure mid-way through the cyber-process