"In medias res" is Latin for "In the middle of things" and it describes how classical drama begins. Oedipus enters Thebes during the plague and the story proceeds from there. There are technical reasons why classical drama did this, mostly because the events of the play took place in the same time as the play itself -- the Unity of Time. There were no flashbacks or cuts.
It's also usually the way a Doctor Who story takes place. The Doctor is called in because an invasion is taking place or drops in on a spaceship to find it is about to be blown up and its cargo of dinosaurs will be destroyed. There is no unity of time. Time is usually composed of moments. Not in this episode.
Chris Chibnall has written a brilliantly different episodes that gives the audience an idea of how the Doctor sees the world: as a collection of discrete moments that fit together like a jigsaw puzzle. He drops in occasionally on Amy and Rory to discover that their everyday life is forming a gestalt that excludes the Doctor. He is becoming an occasional intruder and we can see the true end of their journeying with him.
As a meditation on Doctor Who, this is a brilliant piece of work. The occasional fan or newcomer should be amused by Matt Smith's eccentric portrayal. The long term fan will enjoy the fun and also recognize how the pieces of the puzzle fit together.
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