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Just thinking about Wild Blue Yonder and the Welsh tradition of Mari Lywd (the horse skull that visits your door), and the Doctor treating the no-things like evil spirits with the salt and then being worried about invoking a superstition at the End of the Universe…
…and then there’s the captain of the ship, literally a horse skull, knocking at the door, invoking this tradition that is shrouded in mystery and is thought to have been originally meant as a way of warding off evil spirits…