The BBC have released the synopsis for "Listen" - written by Steven Moffat, it's the fourth episode of Series 8 and will air on Saturday 13 September:When ghosts of past and future crowd into their lives, the Doctor and Clara are thrown into an adventure that takes them to the very end of the universe.
What happens when the Doctor is alone? And what scares the grand old man of Time and Space? Listen!
Written by Steven Moffat / directed by Douglas MacKinnon