"We were tricked into coming here and altering our own time line!" So says Nine on this morning's page. So, the big question is: Who's manipulating the Doctors this time? Readers have suggested a wide array of both Classic and New Who villains who might be responsible for bringing the Ten Doctors together.
One party that we can rule out is the Daleks. Given all of their subsequent appearances, as far as I'm concerned, they already won the Time War. It would have to be someone with an interest in preserving the Time Lords. (We can also rule out Faction Paradox. They're not on the show, so as far as TTD canon is concerned, they don't exist.)
Here are my top suspects:
1. The White Guardian. Not the Black -- he'd be more interested in having Daleks overrun the Universe, without any Time Lords around. He can easily have that as things already stand. The White Guardian, on the other hand, might be willing to go that far in order to make sure that there are still Time Lords.
For the record, I refuse to acknowledge the episode "Father's Day." As far as I'm concerned, Rose found some milk in the TARDIS refrigerator that was 300 years past its sell-by date, got very sick, and hallucinated the whole thing. But if I'm wrong about that, then that incident shows that not having Time Lords around to step in* when things get too far out of hand is causing real problems for the Universe. The WG might want to make sure that they're still on hand to deal with such things.
2. The Time Lords themselves. (Work with me here.) Yes, we've been told over and over that they're all dead, after the war. But then, we were told that the Daleks were all dead, too. Show me the smouldering remains of Gallifrey, and I MIGHT consider the possibility that the Time Lords are extinct.
Assuming, then, that other Time Lords survived the war, the big question is: Would they take the extreme step of altering the timeline, even to preserve their own existence? This would go against every instinct that they have.
But then, we've seen them violate the Laws of Time in the past to preserve themselves. They brought the Three Doctors together to defeat Omega, even though that was a major no-no for them. To keep secret the Andromedan Sleepers' invasion of the Matrix, they moved Earth, rechristened it Ravolox, and tried to set the Sixth Doctor up to take the fall. And lest we forget, they were the ones who started the whole mess in the first place by sending the Fourth Doctor back in time to prevent the creation of the Daleks. (Which he refused to do, but that's neither here nor there.)
In fact, the more I think about it, the more it seems like bringing Ten Doctors together to get them to change the outcome would be right up their alley.
3. BOSS. Okay, not really.
4. Just thought of this one: Future Davros. In the new series, the Daleks are equipped with an Emergency Temporal Shift. After Caan flew back into the Time War and rescued him, that would mean Davros would have access to that technology. He'd surely have no qualms about traveling back and teaming up with his younger, pre-Time War self. (The Two Davroses, there's a fun thought!)
Of course, why would Davros do that? Simple -- to prove that he can. He's just egotistical enough to want the Time Lords (and especially every available incarnation of the Doctor) to see him and his Daleks become the undisputed masters of time and space. (Just before he destroys them.)
* - and by, "step in," I mean, "send the Doctor in, look the other way while he saves the day, and then punish him for interfering."
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