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Doctor Who: Knock Knock – Official TV Trailer

The BBC has released an official TV trailer for this week’s episode of Doctor Who, Knock Knock.

The trailer, which features the episode’s special guest star David Suchet (Poirot), can be seen below:

The next time trailer for the episode, which aired immediately after last week’s episode Thin Ice, can be seen here.

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