There was a goblin. Or a trickster, or a warrior. A nameless, terrible thing, soaked in the blood of a billion galaxies. Nothing could stop it, or hold it, or reason with it — one day it would just drop out of the sky and tear down your world.
That’s what’s in the Pandorica. And Dalek, Sontaran, Cybermen, Slitheen and God knows who else’s fleets are gathering to witness its opening — and probably kill what’s in it, no questions asked. And what would all of them be so damn afraid of?
The Doctor. Seriously, who else? The Oncoming Storm, the Destroyer of Worlds, the guy who has a lot of blood on his hands, even the blood of his own people, the madman who just drops out of the sky in his TARDIS and turns your world upside down until you hardly recognize it anymore — or yourself, for that matter. The guy you can rarely stop, rarely talk sense into.
And the fact that the Doctor narrates this (whether he cited from his own knowledge or from a text, we don’t know yet, so interpretation hinges on that a bit) could be an indicator that this is a testimony of his own dark side, of the Dream Lord, who promised he wouldn’t just stop to haunt the Doctor.
The thing is: when have they — and who exactly are they? — thrown him in there, which regeneration of himself is that, and how bad would it be for the two of them to meet? It is certain that the TARDIS is going to be destroyed and the Doctor will vanish, but what plan does he have to get [it] back?
The other thing is: if it’s not the Doctor — then what is it? What could be so terrifying that we haven’t met yet?
That’s my Holy Crap Thought of the day.