Behold, the intense, nostalgic trailer that is guaranteed to make the heads of Doctor Who fans explode.
Here's exactly what the Doctor says in the trailer:
"I've been running all my lives. Through time and space. Every second of every minute of every day for over 900 years. I fought for peace in a universe at war. Now the time has come to face the choices I have made in the name of the Doctor. Our future depends on one single moment of one impossible day, the day I've been running from all my life. The Day of the Doctor."