The Three Doctors (Doctor Who) the Third Doctor (Jon Pertwee) for help when Omega drains their civilisation's power. The serial opened the tenth anniversary year of the series, and features the first three Doctors all appearing in the same serial. This makes it the first "Doctor Who" story in which an earlier incarnation of the Doctor returns to the show. A superluminal signal is sent to Earth, carrying with it an energy blob that seems intent on capturing the Doctor. The homeworld of the Time Lords is also under siege, their power being drained through a black hole. Trapped themselves, and desperate to send help,
Doctor Who (series 9) were both prequels to "The Magician's Apprentice". The ninth series is the second starring Peter Capaldi as the Twelfth Doctor, and the third and final starring Jenna Coleman as the Doctor's companion Clara Oswald. In "Doctor Who Magazine", Michelle Gomez confirmed that she would return as Missy, the latest incarnation of the Master, who served as the main villain in series 8. In February 2015, it was confirmed that Missy would return in "The Magician's Apprentice" / "The Witch's Familiar", the opening episodes of the series. In January 2015, it was announced that actor Paul Kaye had a guest role