Author's Note: Series 6 never did explain how the Silence had wound up all over the place in 1969!
"Do you think that this friend of Amy's—Jack or whatever his name is—is the person who sent us to Wester Drumlins in the first place?" Martha asked.
They were now back in the flat that the Doctor and Martha were renting. Apparently, their Tardis was back in 2007, and they were laying a very complicated set of clues down for a woman named Sally Sparrow to find, so that she could send the Tardis back to them in 1969. In the meantime, the Doctor and Martha were grounded in 1969, with only the items in the Doctor's pockets and a packet of information from Sally Sparrow to help them.
"Well," said the Doctor, tilting his chair back, "seems likely enough. It had to be someone who knew exactly where and when I'd be. Bit tricky, that. Not sure precisely how anyone could do it…"
"Hold on, someone sent you to Wester Drumlins?" Amy asked.
"Unfortunately," said Martha, rolling her eyes. She drew something out of the packet and handed it to Amy. "We found this taped to the door of our time machine, so naturally, we had to check it out. We didn't know we'd run into the Weeping Angels."
Amy stared at the blue envelope in her hands. Tardis blue. Inside was a set of spacio-temporal coordinates. She turned it over. There was a number five on the back.
"Yeah, we couldn't figure out the number either," said Martha.
"I always rather liked fives," mused the Doctor. "Good old number five. Good things always come in fives, did you know that, Martha?"
"Three weeks ago it was pairs," said Martha.
The Doctor made a face. "Pears? Can't stand pears. Why would I say pears? Yech!"
"Not 'pears', I meant… oh, never mind."
Amy had started looking through the rest of the packet, hoping to find more clues. Something to help her figure out how to save the Doctor's life. She examined the transcript, the list of movies, the photographs of the Wester Drumlins walls. Nothing. Just the blue envelope.
"So, what's all this about a mission, then?" asked the Doctor. "Anything to do with the marks on your arms?"
Amy looked down at her arms, and remembered.
"There are these creatures," she said. "They are all over the place, at least in the United States, but no one knows because you don't remember them. While you're looking at them, you remember. But the moment you look away, you forget everything that's happened while you were watching them. Even you, Doctor."
"Rubbish," said the Doctor.
"You know, that might explain a lot," said Martha. "He keeps going on about how we're always jumping forwards in time, but the Timey-Whimey Detector never seems to pick it up."
"Martha, unless it was specifically designed for Time Lords, there is no way that…" the Doctor trailed off. He pulled the Timey-Whimey Detector over to him, and shoved a pair of black spectacles on his nose. "So that was what he meant," he muttered, poking at the innards of the device.
"Does that mean that you're going to stop mucking about at home and go out and get a proper job?" asked Martha.
"These aliens," said the Doctor, pointedly ignoring Martha. "All across the States, you say?"
"Yeah," said Amy. "And possibly further. The… my friend wants us to go across the world and see if they're everywhere or if they're just in the United States. He wants to know if these are invaders or an occupation force."
The Doctor scratched the back of his head. "Well, if Martha's right," he said, "and, let's face it she probably is. Martha's brilliant, after all—I'd say genius, but I'm in the room. At any rate, if Martha's right, and those temporal-jumps-that-aren't-temporal-jumps are actually memory lapses, then your monsters are certainly here. I can guess why, actually. Massive energy spike like that should attract all sorts to planet Earth. They'd be mostly pilot fish, at first, but I suspect it's only a matter of time before others move in."
Martha frowned. "Hang about, you said that there was a temporal jump back at that warehouse when we picked up Amy," she said. "Does that mean…"
"Oh, yes!" cried the Doctor. "There was one right under our noses and we didn't even know it!" He frowned. "Well, that certainly explains who the Weeping Angel was headed for."
"But if this memory altering alien got touched by that Weeping Angel, it would have gone back into the past," said Martha. "You don't think that's how they conquered Earth in the first place? Because we sent an army of them back in time using these Weeping Angels?"
"Nah," said the Doctor. "It was just one, after all. I doubt one alien is really going to make all that big a difference."
Amy was starting to get a horrible feeling of dread in the pit of her stomach. "Doctor, you said that you've been picking up a lot of these temporal jumps. How many of those temporal jumps happened around Weeping Angels?"
The Doctor thudded the front legs of his chair against the ground. "Ah," he said.
Martha and Amy looked at one another. They knew they were both thinking the same thing.
"So we've inadvertently allowed an alien race to conquer humanity?" Martha asked.
The Doctor looked thoughtful for a moment. Then he gave Martha a manic grin that didn't reach his eyes. "Course not. If I'd done something like that, there'd probably be some future me running around trying to fix it."
Amy felt her heart stop.
"Besides," the Doctor continued, "that sort of thing always leaves a scar. You know, some sort of massive outpouring of temporal energy, all at once…" he paused.
"Like that massive temporal energy spike you've been going on about since we got here?" asked Martha.
The Doctor blew a breath out of his cheeks. "Nah," he said, eventually. "Can't be. Spike's centered in the States, not here. New York, if I'm not mistaken. Got another smaller spike over here, round about the same time, but, well, I already know about that one." He shot Martha a charming smile. "Besides, we'd know if we'd inadvertently wound up causing something like that. I mean, the temporal leakage from that kind of chrononic distortion loop would attract all sorts of temporal scavengers. Saw this before with Rose. Big, nasty anti-time type creatures swooping through the air, all sorts of alien types pouring in from across the cosmos to feed off potential temporal energy…" He trailed off again.
"Like the Weeping Angels," said Martha.
"Possibly," the Doctor admitted. "Quite possibly." He looked over at Amy, his eyes glued to the vortex manipulator around her wrist. "Although it doesn't have to be my interference that caused this sort of temporal instability. It could be, say, any secret government institution that enjoys messing around with potentially dangerous technology it doesn't understand."
Amy looked up at the Doctor, and shivered. She had seen the Doctor angry before. She'd seen him intimidate his enemies with only a look. But she never expected to be on the receiving end of it.
And then, all of a sudden, the darkness was gone from the Doctor's face, and he gave her a charming smile. "Well, now, Amy. Big comfy flat here, with walls and doors and everything. How would you like to spend the night?"