The Odd Beginning of Something Great

How long were the 'Dark Times', as the Doctor calls them? After Amy and Rory? Enough time for another companion, perhaps. Just enough for one girl who was never mentioned, or maybe just forgotten. One girl who could see everything at any point at any place. One girl who could save the universe with her gift, or destroy it all the same. One girl, the only girl, who could save the Doctor's life--and bring it back.

P.S. The Doctor, River Song, the TARDIS, Krillitanes, Daleks, etc. belong solely to the BBC. I own Paisley, and other side characters you've probably never heard of.
P.P.S. I suggest you watch as many episodes as possible, because I've seen all of series 1-7 and will probably make reference to a bunch :)