Doctor Who: Short Trips: The Darkened Earth (8.7)

Mrs Constance Clarke has faced perils on many planets, but now she finds herself in the most dangerous place on Earth. A place like home, yet terrifyingly different, where ordinary decent folk might hand her over to a dreadful fate. And as night falls, she and the Doctor realise that something is on the prowl outside, a creature darker than the dark. And hungry...