This is another in the series of Companion Chronicles, where a companion of an earlier incarnation of the Doctor relates a tale of their time travelling with that Doctor. In this instance, Anneke Wills tells a story of her time as Polly, travelling with the Second Doctor, Ben and Jamie McCrimmon. The Tardis is caught in an apparent block while travelling through time and space, and when the Tardis lands in what seems to be 20th century London, all is not as it seems. Polly tells this story to an audience in an effort to make them understand how this past event of her life relates to a current emergency, a recorded message which has been heard around the world telling of penalties for using what they call their area of time.
Frazer Hines, as Jamie McCrimmon, also narrates part of the story, as he gets separated from his companions. This was very cleverley done, and neatly fits into the world that we remember from the `classic' Doctor Who stories. Polly and Jamie's relationship, and their relationship with Ben and the Doctor is very clear in this story; and the simple tale becomes one of a group of friends and time travellers attempting to save the universe from a threat they could never have imagined.