Doctor Who: EXACTLY Where Jo Martin's Doctor Fits Into Doctor Who Canon

There was a moment at the end of Matt Smith's tenure where an elderly Doctor with no regenerations left is all that stands between the Dalek forces and the death of a planet. The Time Lords were convinced to give him a new regeneration cycle, and we see the new series signature energy burst blasting ships out of the sky.

When Clara finds the Doctor, he's been rejuvenated into a younger Matt Smith again. We take this at face value, as he tells us that it's taking a bit longer, and then he starts the actor's goodbye speech. And then Capaldi zaps in and we're off to a flying start with the Twelfth Doctor.

But what if Eleven didn't immediately regenerate into Capaldi as shown? What if this is when he became Jo Martin's Doctor, going off on some adventures as the first incarnation of the new regeneration cycle, before becoming Smith again as he picks up Clara?

One episode earlier was the 50th-anniversary movie The Day Of The Doctor and, right at the end of that, we run into Tom Baker's Doctor again, now a curator at the British Museum. Included as an easter egg, Tom mentions that in years to come the Doctor may find himself revisiting a few old favourite faces.

It's a theory, but one I find a bit far fetched, and not just because our Doctor doesn't remember it. Martin's Doctor is from a time when Gallifrey was still a power in the universe, and she seems to have no idea about the Time War or it being locked in another universe. She also not only doesn't use a sonic screwdriver, but doesn't recognise it.

These facts seem to cut out any of the rewrites that happened to time during the Time War, placing this new Doctor after Hartnell but before Eccleston.