Blimey, it’s crept up on us a bit (thanks to two low-key preceding episodes), but this Saturday, a MOFFAT SERIES FINALE begins. Exciting, isn’t it?

So naturally, it’s time to start speculating about the nature of the threat the Doctor and Amy will face, particularly given the tease of the “next time” trailer. I’ve got my theory – in fact, I’ve had it for a few weeks, now, and I also think I’m clearly not the only person to have it – which I’ll share after the jump. But what do you think? What’s causing the cracks? Who or what is in the Pandorica?