Peter Capaldi is back as the Doc, but where is the Time Lord? The skies of earth have been frozen by a mysterious alien force and Clara needs him, but he's nowhere to be found.
Who – or what – is he hiding from? Past deeds are about to come back to haunt him and he's going to come face-to-face with old enemies. Is survival impossible for the Doctor and Clara?
Doctor Who, BBC1, 7.40pm
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