The venerable British science fiction series Doctor Who is back with a new season. Ncuti Gatwa — who is Black and openly queer — brings a vibrant energy to the story of an alien who travels through space and time in a blue box. The series, now streaming on Disney+, also features the return of showrunner Russell T. Davies, who birthed the modern era of Doctor Who. But what does this mix of new and old mean for the sci-fi institution?Learn more about sponsor message choices: podcastchoices.com/adchoices)NPR Privacy Policy)