The BBC have today released the airdate and official synopsis of the fourth episode of the eighth series of Doctor Who. The episode, penned by showrunner Steven Moffat is set to air on the 13th of September. The official BBC synopsis runs as follows:

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!

With thanks to BBC Media.