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doctor who - How did River Song know to go to Earth after the events of The Big Bang?


In The Big Bang (the concluding episode of the Pandorica arc), the Doctor is erased by the cracks in space-and-time. Yet Amy brings him back by remembering him, which is triggered by River Song dropping off her diary with Rory and then walking past the window. Since the Doctor never existed at that point, what made River Song go to Earth and drop off a blank diary with a random stranger?



Answer




Spoilers for S6E7, A Good Man Goes To War:



River, being part-Time Lord, probably is capable of remembering people after they're consumed by the crack. She didn't mention this detail in The Big Bang, as it would reveal too much about herself too soon. After the universe was restarted, she remembered the Doctor, and had her journal/diary although the writing in it had been wiped as it no longer happened. So she left it for Amy as a reminder of the Doctor, just like the ring had previously reminded her of Rory.



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