The bulk of the triangle’s tease has revolved around Clara’s deceptions, which crumble entirely in "The Caretaker," thanks to the Doctor covertly scheduling an alien invasion intervention in Miss Oswald’s backyard, Coal Hill Secondary School, and finally coming face to face with her boyfriend (and vice versa). One of the cheapest-looking aliens the new series has unveiled, the Skovox Blitzer is attracted to the area because of all the artron emissions, which were likely left by the Doctor himself since the TARDIS materializes and dematerializes at the school regularly, not to mention his numerous other visits to the area in his past lives. The invasion storyline is so rote and B-movie in scope that it must exist only to serve as a basic introduction for Danny to the world of Clara and the Doctor. In any case, the Doctor either hasn’t considered that he may actually be responsible for the alien’s presence, or he has and has chosen to take care of business and not mention that part (to Danny he outright denies it). Either is a real possibility with the Twelfth Doctor.
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