I love the way they did this. Clara and the other Doctors... "I don't know where I am. I just know I'm running. Sometimes, it's like I've lived a thousand lives, in a thousand places... I'm born, I live, I die. And always, there's the Doctor. Always I'm running to save the Doctor, again and again and again. And he hardly ever hears me. But I've always been there. Right from the very beginning. Right from the day he started running."