A number of changes were made in the cast and production. Peter Capaldi had retired from his role as The Doctor and was replaced by the Thirteenth Doctor for Series Dubs. Eager to continue participating in the show in some way, he had asked instead to become Showruiner. The BBC responded politely that since Chris Chibnall was currently the showrunner and had no intention of leaving, Capaldi could not be hired for that position. Chibnall was found dead by the side of the road in Cardiff, a mystery that still baffles even Scotland Yard to this day.