Gwen's eyes flicked down to the folder, then back up to Martha's face. "What do you mean, 'they're not'?" she asked, confused.
"They're not…human."
Gwen frowned, then picked up the folder and opened it. She flipped through the pages without changing her expression. At last, she spoke. "Do you think this counts as the world ending?" her voice trembled slightly, the only outward sign she gave that she was seriously rattled.
"I don't know."
Gwen glanced at the younger woman. "If we're not gonna get Jack back here, what do you suggest we do?"
Martha considered this for a moment, and then a small smile crept across her face. "There's someone else we can call."
Martha shoved her hands into the pocket of her jacket in an attempt to protect them from the cold wind which had seemingly sprung up from no-where. She glanced up at the grey sky, thinking longingly of the week before when it had been nice enough to sunbathe in the garden in a bikini.
"Come on, come on!" she muttered, looking around.
"Martha!"
She turned, grinning, and waved at the approaching figure. "Nice of you to show up!"
"I came as soon as you called!" The Doctor said indignantly. Then a huge grin broke out on his face. "Honestly, twice in three days you've called now! I feel almost popular!" he gave her a hug. When he released her, his expression was more serious. "Now, what's this big emergency?"
"It's about that girl you met at the wedding. Kitty."
"Ah yes. Lovely girl, not so sure about the mouth. She could have talked the hind legs off a Liophelt, and they've got 6 of the things. What about her?"
"She's not human."
He looked puzzled. "I thought Jack said she was?"
"He did."
"Oh."
"Look at these." Martha told him, handing over the medical test results. The Doctor took them, and his frown deepened with every turn of the page. But Martha couldn't help noticing a spark of boyish excitement in his eyes. That was one of the things she had loved about the Doctor, his ability to see everything as an adventure.
"I've never seen anything like these…" he said, tracing a finger over one of the X-rays.
"What do you think we should do?"
"Are you sure you need to do anything? She could have been alien when they met her you know. I mean, how likely is she to bring that up? 'Oh, nice to meet you, by the way I'm not really human'? Especially if they know Torchwood catches aliens."
"But there aren't aliens in her universe. Or if there are, they haven't found Earth yet."
"When did she come here?" the Doctor asked.
"I don't know. Gwen said she got a call from her friend Andy at the police station that she'd come in, and when they went down to see; she knew Ianto and Jack."
"So no-one actually saw her arrive?"
"Well, no, but…"
"What do you thinks going on?" he asked her, seemingly abandoning his previous train of thought.
"I don't know. Maybe mind control or something? Make them think they met her through the Rift when they didn't?"
"Maybe…" he didn't sound convinced. "But personally I think it's entirely possible Jack and Ianto met Kitty Hadley in another Universe through the Rift."
"Well then what do you think?"
"It's also entirely possible," the Doctor went on, gazing at her intensely, "that Kitty Hadley…is still there."
Gwen gaped at them when they arrived back at the Hub and the Doctor told her his suggestion. "So, what, we think this isn't the Kitty that Jack met in the other world?"
"We don't know much of anything right now." The Doctor told her, "But it is a possibility." He frowned through the glass wall at the young woman mopping something up on one of the desks. "I have to say though, she doesn't exactly seem like much of a threat does she?"
"But why would she lie if she wasn't?"
"I caught her going through one of Jack's files earlier." Gwen told them. "At the time I assumed she was looking for information on getting home, because it was one of his data sheets on Rift activity since she got here. But what if it wasn't, what if she just happened to pick that one up because it was on the top of the pile?"
"Advanced guard?" the Doctor suggested.
"Could be."
"I don't know…" he cast another, almost anguished, look at Kitty. "I just don't see it. She seems so…normal."
Martha raised an eyebrow. "Normal?"
He flushed slightly. "As in, not a psychopathic alien killer type person. She's been here…how long? And she's been living with Ianto the entire time, it seems like she would have done something by now if she meant any harm!"
"I thought there was something weird about her from the start." Gwen said. "I mean, something just didn't add up about her story, you know?"
The Doctor glanced at her. "What do you think we should do?"
"I'm sorry?"
"You're in charge, right? So what should we do?"
Gwen could hear something strange in his voice. It was like he was testing her.
"I think we should put her in the cells until we know what we're up against." She said firmly. Something which might have been disappointment flashed in the Doctor's eyes, but it was gone in an instant.
"Alright then. Cells it is."
"Why am I down here?" Kitty asked as Martha and the Doctor led her down towards the cells. "And why's the Doctor here? Not that I don't think it's amazing." She assured him quickly, "But I didn't think you were sticking around?"
"Oh, I thought I'd come help out. They are two men down after all."
"Right."
"In here." Martha said, holding open the door to the cell. Kitty cast her a curious look, and walked inside.
"What is? I don't understand what…" she broke off and whirled round as the door slammed shut. "Martha?"
"I'm sorry."
"This isn't funny, let me out. Ok, I loved it before, but now I want out."
"We can't do that." Gwen said, appearing from no-where and making the Doctor jump.
"What?"
"We know what's going on." Gwen told her.
Kitty looked completely bemused. "Well, that puts you one up on me then. What is this?"
The Doctor scuffed his feet on the floor uncomfortably. Gwen scowled at him. "We know you're not human."
Kitty let out a short bark of laughter and clapped a hand over her mouth. "W-what?"
"We know you're not human."
"Is this a joke? Some sort of prank or something?"
"I'm sorry. I'm so sorry." The Doctor said softly.
Kitty shook her head. "Nuh-uh, don't say that do me, don't you dare! That's what you say when someone's dying or in trouble and you can't help. Why am I in trouble?!"
Gwen said nothing, merely walked off and motioned for the other two to follow her.
Martha threw Kitty a sympathetic look as she followed. The Doctor stood for a moment watching her, his face impossible to read.
"Doctor?"
"I really am sorry." He said. Then he followed Gwen and Martha out of the room.
"Ok, we need to go over CCTV footage of when she arrived, see if we can locate her. I'll talk to Andy and see what he thought of her, whether she was suspicious or anything…"
"Right." Martha answered. She wasn't really listening to the older woman; she was watching the footage from the cells; where Kitty was sat huddled in a corner staring out at Janet. She certainly didn't look like someone who'd just been found out. She looked confused, scared, and slightly angry.
"Do you have any idea what I just said?" Gwen asked her.
"Um…"
"Something about bananas?" the Doctor asked sounding vague, like he was thinking about something else entirely.
"How's she doing?" Gwen asked, indicating the screen.
"Seems like what you'd expect from anyone locked in there. She doesn't seem freaked out we've discovered a big secret or anything."
Someone cleared their throat loudly from behind them, causing both women and the Doctor to jump and spin round.
Jack Harkness stood in the doorway with his arms folded. He did not look happy.
"Does someone want to explain to me just exactly what the hell is going on?!"
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