The Doctor stood facing a wall, reading all the notices as Amy scanned through the computer database. He moved over to her, bending over slightly and using his hand to steady himself on the chair as he peered over her shoulder.

"Anyone in there who looks like me?" He said, already knowing the answer but figuring he could use whatever she found in the system to help him figure out what was wrong.

Then he saw it.

"Hold on, go back to number 47384." He said, with her complying "That's impossible."

He looked at the picture in disbelief. It didn't seem possible. He was staring at Miss. Hartigan who he'd met in the 19th century.

"I know that woman." He said, looking at Amy "But it's not possible. She's dead."

"Well, much as I love to see you're apparently getting your memory back, she looks alive and well to me." Amy replied to him "How do you know her?"

"What year is it?" The Doctor said, worried.

"2010." She said, looking at his face "Okay, I'm starting to think you do have your memory. Who are you, really?"

"I told you, I'm the Doctor." He said "And that woman in that picture is meant to be dead."

"And how would you know that?" Amy said, slowly getting up and moving to the door "Did you kill her?"

"No, someone else did that before I even met her." He said "She lived in the 19th century. There were these things, these Cybermen, like the ones that came from those ghosts a few years back. They killed her so she could be their leader. And if she's back, we're in trouble."

"Why's that then?" She said, not believing him but deciding if he was insane, it was better to humour him.

He began to pace around the room, obviously trying to think of a good way to explain whatever it was he was about to say. Eventually, he turned to face her, hands by his sides.

"I trapped her, well, what was left of her, in the time vortex. It's this rip in the fabric of time and space." He said "It lets things travel between different places in space and time, provided you can get into it. She was in there with an army of Cybermen. I thought that would stop them, but apparently not. And I know why."

Amy just sat there looking at him like he was insane, which she would've had to admit, she did, as he continued.

"See, recently, I had this thing go on, with someone called the Master." He said "He-"

"Hold on, I'm going to stop you there." She said, holding a hand up to ensure he understood "What kind of a person calls themselves the Master?"

"Well, exactly." The Doctor said, before looking at her "It's an abbreviation. He likes to think of himself as Master of all or Master of time and space."

"OK then, I have to ask, who the hell are you?" She said, asking him for the third time.

"You sure you want to know? You're absolutely certain?" He said, with her slowly nodding before he continued "I'm the Doctor. I'm a Time Lord. I'm from the planet Gallifrey in the constellation of Casterberus. I am 906 years old, and, if you're lucky, I'm going to be the man to stop the Cybermen and save the Earth."

She looked at him dumbfounded. It was more or less the reaction he had expected; the same one as he had got when he used more or less the same speech on the space liner Titanic.

"So, just to clarify, that woman's from another time, you're an alien, and these Cybermen, they're, what, robots?" She said.

"If only." He said with a dark look on his face "The Cybermen are from another reality. They're worse than robots. They're mechanical, sure, but way worse than robots. They were people, but that was before the Cybermen caught them. Now, they've had their brains placed into mechanical bodies and all emotions removed. They live to turn everything else into Cybermen."

"What, no alternatives?" She asked him.

"Oh, there are." He said "The other option is for them to delete you. And by that I mean, well,-"

"Kill us." She said quietly "And this woman, she'll have them do that?"

He nodded sombrely. She looked at him, puzzled. How did he know all this? It wasn't really possible he was an alien, was it? He looked so... Human.

"Anyway, thanks very much for your help." He said to her, shaking her hand before going to walk out.

"Hold on Doctor." She said, getting up and jogging to catch up to him "I'm coming with you."

"Oh no, it's way too dangerous." He replied

"You're going aren't you?" She said.

"Yeah but-"

"And I've had training, so let's go." She finished "We're going to deal with them now then you can explain all this to me."