That will change in the upcoming ninth series: The penultimate episode will feature Peter Capaldi as the Doctor and no one else; no co-stars, no guest cast, nobody for the entire 45 minutes!
Executive producer Brian Minchin said: “Doctor Who has always been about taking risks. It’s never sat down and done a normal episode. It’s always done something extraordinary. Our audience likes to be challenged.”
Written by showrunner Steven Moffat, Episode 11 has been described by director Rachel Talalay as, “One of the most complicated and different episodes that I’ve ever done.”
Moffat called the story “a ludicrous challenge.”