2. All Of Clara's Echoes Will Unite To Take Over The World
Oh, blimey. Just imagine the unequivocal chaos that would ensue throughout the universe if every Clara echo ever joined forces to become Series 9's 'big bad' as an all powerful race of unadulterated evil. Stranger things have certainly happened in a Doctor Who finale, and the real Clara would probably have to die to put a stop to them, since she would be the only thing keeping them alive. As always, only time will tell...