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

2. Midnight

Not content with writing just one all-timer involving one half of the Doctor/companion duo in the second half of Series 4... RTD also wrote another.

Midnight’s not your usual Doctor Who story. It's 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 the phenomenal Lesley Sharpe, who is 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.

Perhaps the most impressive thing about Midnight is that its script was written in a matter of days after another planned episode fell through. Diamonds are formed under pressure, after all.