Knock Knock (TV story)

 was the fourth episode of the tenth series of Doctor Who produced by BBC Wales.

Synopsis
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Plot
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Cast

 * The Doctor - Peter Capaldi
 * Bill - Pearl Mackie
 * Nardole - Matt Lucas

Crew
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Story notes
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Ratings
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Filming locations
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Production errors
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Continuity
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DVD releases
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Blu-ray releases
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Digital releases
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