Ooh, I like that. Into the headcanon it goes.
How do you square this with Season 6B?
My very condensed take: The Second Doctor is splintered from just before the Third Doctor regenerates and continues on going about partly or mostly as a CIA agent in parallel to the Third Doctor's existence, no?
Well, my headfanon: the Second Doctor thinks he's gonna return and accept to regenerate into the Third Doctor, as he does in
The Five Doctors, but as he returns he finds out he's intended to keep working as a CIA agent, while the Third Doctor will eventually die, unable of regenerating (because of the season 6B split, Pertwee's unable to regenerate). He refuses this and escapes, but is cought and naturally regenerates (naturally, as a splinter's lifetime is seemingly limited) and regenerates to Jo Martin, who continues on being a CIA agent, always mindful of escaping...until she finds out the complete truth about the Division, which turns out is also the organization that splintered the Second Doctor and sent him in the season 6B adventures (including the BF ones,
The Two Doctors and
The Five Doctors) for their own, mysterious purposes. However it happened, and we may never find out, Martin's time was up, and my next headcanon comes forward:
The Watcher is the Jo Martin, midway regeneration. Basically, she's the "side" of the Doctor who could regenerate, and without it, the Doctor could never naturally regenerate (he only regenerates in
Planet of the Spiders because of the Hermit's "little push"). Also, being a Division agent, she's probably aware of the circumnstances of her own regeneration into Five, maybe even specific info. But, she;s aware that if she does "unite" with the Doctor, she will forget everything about her life as the Fugitive Doctor. Indeed, everything about season 6B. And it makes sense. The Sixth Doctor did
not remember the events of
The Two Doctors from the Second's perspective. The Second Doctor clearly remembers meeting the Third Doctor before in
The Five Doctors. It seems plausible to look at the CIA/Division Doctor as immune/enhanced towards multi-Doctor encounters. So, with that knowledge, she guides the Fourth Doctor towards the events of
Logopolis and, together with Tom Baker, Jo Martin regenerates into Peter Davison.
Its a
bit different, but also fundamentally the same. My best surprise from the above theory is, it almost logically explains why Peter Davison was a visible super-mess during
Castrovalva. He's the Doctor who has the re-adjust with his missing half for a long, long time and also cope with his insane memory loss.
Anyway. Sorry for the really long post.
