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Doctor Who: Introduction To Knock Knock

The BBC has released two videos introducing this week’s episode of Doctor Who, Knock Knock.

The first video features executive producer Steven Moffat hinting at the nature of the episode’s threat:

The second sees Peter Capaldi and Pearl Mackie hint at what awaits the Doctor and Bill in Knock Knock:

Knock Knock airs on Saturday 6th May at 7:20pm on BBC One and at 9/8c on BBC America.