I Really Hope I'm Wrong, But Doctor Who Might Have Set Up Kate Stewart's Exit After 13 Years

Warning: Spoilers ahead for Doctor Who season 15, episode 4, "Lucky Day."Jemma Redgrave has played Kate Lethbridge-Stewart, known professionally as Kate Stewart, since Doctor Who season 7, episode 4, "The Power of Three," but season 15 might have just revealed her time on the show is up. Kate creates a direct connection to Doctor Who's classic era, as she's the daughter of Alistair "the Brigadier" Lethbridge-Stewart - a recurring UNIT ally to a number of Doctors before the 2005 revival. Although joining the show in 2012 means Kate's debut in Doctor Who's modern era arguably came pretty late, she has made some excellent contributions to the franchise.