10 Most Obvious Doctor Who Plot Twists Ever

10. Who Did River Song Kill?

In Flesh and Stone it's revealed that Doctor River Song was locked up in the Stormcage Containment Facility for murdering someone. When the Doctor questions Father Octavian about River's crimes, the cleric tells him that she killed "a good man... a hero to many."

Well gee, wonder who that could possibly be?

As if it wasn't obvious enough, River then essentially comes clean to the Doctor and tells him that her murder victim was the "best man" she'd ever known. However, she can't say any more for fear of spoilers, and we had to wait a whole series to have our suspicions confirmed.

Despite how many times we fruitlessly paused The Impossible Astronaut to see beneath the astronaut's visor, we knew deep down that it was always going to be River Song. It's arguable that one of the reasons Series 6 can be so frustrating is because it layers mystery upon mystery upon mystery – but if the Doctor was confirmed as River's victim from the off, more drama could've been drawn from the how and the why of the murder. 

It would also have taken some strain off the series other big mysteries like River's true identity, and what's going on with Amy. Instead, you're waiting for the inevitable reveal of who the Doctor's killer actually was.