The latest instalment, The Interstellar Song Contest, saw Archie Panjabi introduced as the newest incarnation of the classic Doctor Who villain known as the Rani, after she and Anita Dobson's Mrs Flood bi-generated.
Showrunner Russell T Davies has confirmed that the Rani only counts as one part of the Unholy Trinity, meaning there's another villain still set to join the ranks.
Teasing the new episode, Wish World, on Instagram, he said: "Enemies old and new unite as the Doctor faces the Unholy Trinity."
The showrunner went on: "The Pantheon is stirring. Old friends are helpless. And the whole of reality is in danger as we hurtle towards May 24, in the Ranis’ most terrifying experiment yet.
But who could it be? Could we expect another classic villain to return, after the likes of the Toymaker (Neil Patrick Harris) and Sutekh (Gabriel Woolf) last season and now the Rani? Or someone completely new?
It remains to be seen how Mel is going to react to the return of her enemy, the Rani, with the pair last coming face-to-face in the 1987 story Time and the Rani.
Speaking on Doctor Who: Unleashed, showrunner Russell T Davies said: "Finally we found out who Mrs Flood is. I think ever since Mrs Flood appeared people have been saying she’s the Rani, and sometimes you just want to deliver what people expect.
"It was kind of the plan almost from the beginning. I always thought she was the Rani. Which actually is a very old Doctor Who villain who’s never been brought back since the show came back in 2005. She’s kind of been waiting in the wings, and the time has come."
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