User:SOTO/Forum Archive/The Reference Desk/@comment-6047958-20160409035536/@comment-6047958-20160420034127

PicassoAndPringles wrote: It was first used in the Seventh Doctor novel Love and War by Paul Cornell. It's been used a couple other times outside the tv series; see Aliases of the Doctor for a full listing. So we can assume Moffat or Davies has read those books, or was it ubiquitous among fans at that point, whether you'd read the books or not? (By the way, thanks for the answer! :-D)