Episode 4 of Doctor Who Series 8 is Listen, and a synopsis for the episode has been confirmed today by the BBC.
It goes something like this:
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!
Peter Capaldi and Jenna Coleman star as the Doctor and Clara, with a supporting cast that includes Robert Goodman as Reg. Written by Steven Moffat and directed by Douglas MacKinnon, Listen airs on Saturday 13th September 2014. The episode schedule is yet to be announced.