Trivia: The 2018 novelization, also written by Steven Moffat, includes a scene that he had wanted to include in the episode proper but couldn't due to rights issues, where UNIT head Kate Lethbridge-Stewart, while showing Clara around the Black Archive, shows her the posters of 1960s movies Dr. Who and the Daleks and Daleks Invasion Earth 2150 AD, which were loose adaptations of the first two Dalek serials, "The Daleks" and "The Dalek Invasion of Earth" starring Peter Cushing, and confirming them as existing in the Doctor Who universe. Kate then explains that the movies were made with the Doctor's knowledge, and that he was good friends with Cushing and loaned him a waistcoat to wear in the second movie. The novelization then goes on to add that the Doctor got in some trouble with UNIT for bringing Cushing to the future, to appear in a movie made long after his death - a nod to the late actor's controversial CGI resurrection in the Star Wars spinoff movie Rogue One.
Doctor: So, that's the trap. Or the test or the final judgment, I don't know. But if I kill you, I kill her. Except that implies, in this big grand scheme of Gods and Devils, that she's just a victim. But I've seen a lot of this universe. I've seen fake gods and bad gods and demi-gods and would-be gods - out of all that - out of that whole pantheon - if I believe in one thing... Just one thing... I believe in her.
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