“we took the doctor/companion relationship to a place that’s just more real, much more damaging and with more consequences. it can be a thrilling, exciting relationship but actually it can be a dangerous one too. what we did this year felt like what it would be like if a young girl got into a very intense friendship with an older time traveller.”

“the darkness really comes from the complexity and danger in the friendship between the Doctor and Clara. a lovely and wonderful and warm and serious friendship though it is, if occasionally explosive, it’s a troubling one.”