TheDoctorfacestheendofhislifeastheMaster’splanshurtleoutofcontrol.Withthesoundofdrumsgrowinglouder,andanancienttrapclosingaroundtheEarth,theDoctorandWilfmustfightalone.Butsacrificesmustbemade,andthedeadlyprophecywarns:"Hewillknockfourtimes."
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