Polly Wright relates a story of a time when she was traveling with the Doctor, Ben and Jamie, when they encountered a "wall" in the time vortex that shouldn't have been there, and of the race that erected it and laid claim to a section of time itself.
Tropes
- Ignorant of Their Own Ignorance: The Doctor deduces that despite the Vist's natural ability to travel in time they don't actually understand time travel; he describes it to Polly with the analogy that just because a seagull can fly that doesn't mean it understands the concept of aerodynamics.
- Separate Scene Storytelling: As Polly tells the story, the action switches to the past and the scenes play out from her point of view.
