However, when incoming showrunner Chris Chibnall informed outgoing Steven Moffat that he failed to want to use the once-a-year Christmas Episode as the Thirteenth Doctor's debut story, and Moffat then acquired that there would be no much more Christmas episodes if a year was skipped, he rewrote the tale to give a "Ray of Hope" Ending to the Twelfth Doctor that right led into his true final episode, "Twice Upon a Time", which wraps up a couple of.