Doctor Who: 15 Cool Details Peter Harness Just Revealed About The Zygon Invasion
14. The Opening Scene Was One Of The Last Things Written
Most of us would assume that the writers of movies, novels, and TV shows - or any other kind of fiction - will start at the beginning when creating their stories.
Clearly though, it's not always that simple. According to Harness, the opening sequence of The Zygon Invasion - a short scene wherein the two Osgoods deliver an exposition-laden speech - was "one of the last things written".
This was done because he wanted to map out the rest of the story first, then write this opening when he knew where the two-parter was headed.