Doctor Who 's regeneration line used to be a simple thing, but ever since David Tennant grew a clone of himself, things have gone a little wonky. We've had metacrisis Doctors, we-don't-talk-about Doctors, Timeless Child Doctors, recycle-old-face Doctors, bi-generating Doctors, and after Doctor Who season 15's ending , companion cosplay Doctors.

At time of writing, Billie Piper is, technically, Doctor Who 's main actor after emerging from the golden glow of Ncuti Gatwa. Clearly, however, stealing the form of an old companion is not normal, so questions remain over whether Piper is playing the true Sixteenth Doctor, or if she's even playing the Doctor at all. With confusion abound, thoughts naturally turn to who might play the next permanent incarnation of Doctor Who 's Time Lo

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