And it looks like we can now add former Doctor Peter Davison to that list, with the actor admitting to being rather baffled by the climatic moment of season finale The Reality War during a recent interview with Starburst magazine.
"I don’t think she is the Doctor. I think it’s kind of just a hand grenade thrown into the final episode to try and go, 'Whoa, what’s this?' And then it’s almost like, 'Get out of that.'"
He added: "I thought she was a fantastic companion, but she’s got a great career, and she’s got options galore. I don’t know why she would voluntarily choose to go back to Cardiff for a year."
Interestingly, a credit revealing whether Piper has indeed become the Doctor was conspicuously absent at the end of the episode, and so it's a question that seems destined to keep fans speculating for a good while yet.
Eccleston said in 2022, before Gatwa was cast: "I was saying to somebody today in the green room that Russell T Davies is coming back, right, and who’s going to be his Doctor? I think it should be Billie Piper, actually.
"Catherine Tate’s great but, I think there’s your Doctor.
After The Reality War aired, Piper said in a statement: "It’s no secret how much I love this show, and I have always said I would love to return to the Whoniverse as I have some of my best memories there, so to be given the opportunity to step back on that TARDIS one more time was just something I couldn’t refuse, but who, how, why and when, you’ll just have to wait and see."
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