A timeline (or more accurately, timelines) of events in River Song's and The Doctor's meetings. (Click for bigger)
River Song. The only person in the universe who can make a Dalek scream for mercy. B1tch please. Rose Tyler. The only person in the universe to show mercy to a Dalek. B1tches please. Donna Noble. The only person who could make the Daleks spin around in circles, helpless.