Russell T Davies' return to Doctor Who has already unleashed a wave of new mysteries in the sci-fi series. The new era penned by Davies, who originally served as Doctor Who's showrunner when the show first returned to television in 2005, started with November's 60th anniversary specials and continued in the Christmas special, "The Church on Ruby Road," starring Ncuti Gatwa as the Fifteenth Doctor. Across these four initial specials, Davies has dropped hints to a range of plot lines that fans can expect to see play out in the upcoming renumbered Season 1 of the revitalized Doctor Who.
Source：https://www.cbr.com/doctor-who-susan-twist-character-theories/
