"I think expectations of Doctor Who should always be high, because it's a show that must always progress and get better and better."

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We're thrilled to have Maisie Williams joining us on Doctor Who. It's not possible to say too much about who or what she's playing, but she is going to challenge the Doctor in very unexpected ways. This time he might just be out of his depth, and we know Maisie is going to give him exactly the right sort of hell.

— Steven Moffat