Doctor Who: Every Russell T Davies Episode Ranked From Worst To Best

Not content with writing just one all-timer chamber piece for Series 4, RTD also wrote another.

Midnight’s not your usual Doctor Who story – essentially one long scene in a single room, with no companion or rubber monsters.

But it’s also a brilliantly-observed study of paranoia and mob mentality, which does so much with so little.

We never actually see the Midnight Entity (in this story, at least). We just get lots of sinister knocking – and Lesley Sharpe, who is completely chilling as the possessed Sky.

The idea of a creature that imitates the people around it is fundamentally so creepy. And there’s a genuine sense of terror at the end, when it looks like the Entity’s going to get away.

The best bit? It was a last-minute script, formed under pressure in a matter of days.

No wonder it was set on a diamond planet.