Doctor Who is a show with a rich, extensive history that reaches all the way back to 1963, and the show’s ongoing lore is continually growing as a result. While the most recent episodes of Doctor Who have done a great job of making the project accessible for new audiences without forcing them to learn everything that’s happened in the past sixty years, the show has never been afraid of referencing its past. Doctor Who’s recent Sutekh revival is a prime example of this, referencing “The Pyramids of Mars” from 1975.