Neil, could you give us a non-spoilery encapsulation of the story?
Easily! It just stops at about minute three. The Doctor has been talked by Clara into taking the two kids she looks after, Artie and Angie, for an excursion, a day out, and he decides to take them to Hedgewick’s World, the biggest, best and most wonderful amusement park in the galaxy, a quarter of a million years in the future, because he has a golden ticket and it gets four people in for free, gets you free ice creams and it gets you to the front of any line, which is great because the lines for the Spacey Zoomer can go on for weeks. And that’s where it starts. Unfortunately, it also starts with them discovering that Hedgewick’s World has been closed for several years and there’s almost nobody on it now except for a small army troop on manoeuvres and a mad old showman named Mr Webley who landed his spaceship there after it closed and is now there with a Cyberman that plays chess. That’s where it begins. This is also 1,000 years after the end of the big human/Cyberman war – where we won.