"Well, certainly on this series, the episodes are much more stand-alone and, in a way, more distinct from each other. You’ll have episodes, but they’ll be much more of a specific genre. And the next week will be a different genre. My episode is in a genre I’ve never written before — frankly, no one has written in that genre for quite a while now. But I absolutely love it. Steven gives me a one-line pitch, and then I’ll go away and put together a story and so on. And he gave me a great one-line pitch for this, so I’m really excited about it."
Toby Whithouse, talking to Anglophenia
First thought - a Historical? ie. with no aliens except the Doctor himself?