"Well? I'm waiting for an explanation."

Gwen cleared her throat nervously. "Jack, we…we were going to try and sort it…what're you doing here?"

"A little tip: next time you want to go locking my friends up you might want to let Toshiko in on it so she doesn't call me asking whether I know what the hell's going on!"

Gwen, Martha and the Doctor all turned to look at Toshiko, who had just walked in. she blushed and looked at her shoes.

"Jack, they were only…" the Doctor began, but Jack held up a hand to silence him.

"What they are doing, Doctor, is trying my patience. I've had to leave Ianto at the hotel while I sort all this out and I would very much like to get back to him. So; an explanation, if you don't mind."

"That's not Kitty."

Jack blinked. "Excuse me?!"

"Or, it might be, we don't know. But she's not human." Martha tentatively held out the medical file, and Jack took it from her.

"What's this?" he asked, flicking through.

"The results from those tests you asked me to run on her a few weeks back. I only just got round to looking at them."

"These…these are Kitty's?"

"Afraid so."

"And there's no chance you've made a mistake?"

"None. I'm really sorry, Jack."

Jack nodded slowly, his face completely unreadable. "Bring her to interrogation room 1."

XXXXXXXXXXXXXXXX

Kitty's face brightened slightly when she saw Jack, but she still looked confused. "Where's Ianto?"

"Sit down." Jack's voice was harsh.

"Ok…what the hell's everyone's problem today? Am I missing something here?"

"Who are you?"

"Umm…Kitty?"

"I'm only going to ask this once more. Who are you?"

"Jack, what the fuck? What's going on here?"

"We know you're an alien."

Kitty gaped at him. "I'm really not."

"I don't know what you are, but you're not Kitty. You've been taking advantage of us, and I don't like that."

"Jack, I really don't know what you mean!"

"Don't lie to me!" he shouted suddenly, banging his fist on the table. Kitty jumped.

Jack gazed at her, breathing heavily. A flicker of doubt crossed his mind. He felt so sure this girl was Kitty; the girl who'd taken him in through the Rift, the girl who'd been so ludicrously excited to see them. If he hadn't been presented with solid proof, he'd have said the others had gone mad.

"I'm not lying." She said quietly, tears glistening in her eyes. "I'm really not, I swear. I don't know what they've told you, but I haven't done anything."

"They don't need to tell me anything." Jack flung the medical file towards her in disgust. Kitty picked it up and opened it, her face growing more confused.

"What is this?"

"Your medical file. You may have got out of giving blood, but I bet you didn't realise your physiology was that different to a humans!"

He watched her reaction as she flicked through the pages. Her face had gone deathly white. "What is this?" she asked softly.

"What?"

"This." She gestured at the file. "This isn't mine. It can't be mine. Because I'm human."

Jack made a throttling motion in mid air, then spun on his heel and walked out. "Come with me. Now!" Kitty got up and walked in front of him, nervously. They emerged into the main area and towards the cells once more.

"Jack…"

"Not now, Gwen!"

"Jack, I really think…"

"What?!" he turned to look at her, then his face froze.

"Hello Jack." Ianto said pleasantly, although his eyes flashed with irritation. "Were you planning on telling me you were cutting the honeymoon short to come to work, or was I just supposed to guess?"

"I…thought I'd be done before you woke up." He admitted.

"Ianto!" Kitty broke away from Jack's grip and ran to the younger man, flinging her arms around his neck before letting go and standing behind him like a shield. Ianto gave her a startled look over his shoulder. "They've gone fucking psycho, the lot of them!"

"What?" he turned back to the others. "Jack?"

"Get away from him." Jack ordered, eyes glued on Kitty.

"Jack, tell me what's going on!" Ianto demanded.

"We don't know. But that," he nodded at her, "is not Kitty. It's not even human."

Ianto frowned, turning his head to look deep into Kitty's eyes. She stared back through tears. "Jack, what do you mean? Of course it's Kitty."

"We've got test results, Ianto." Martha told him. "She may look human, but I've never seen anything like those x-rays and things. Neither's the Doctor."

"Let me see."

Jack handed him the file, never taking his eyes off Kitty. Ianto flicked through, his frown becoming more pronounced. "Well there must be a mistake." He said eventually.

"There isn't." Martha said regretfully.

"There has to be." He looked up. "Jack, I'm good with people. More so than you realise. And I don't care what these results show, I am 100 percent convinced that this is the same girl we met through the Rift."

Kitty grinned, flinging her arms around him once more. "I knew you'd believe me!"

"Ianto, the results aren't…"

"I don't know what they mean, Jack. But I know she's the same girl who helped pick my ring. The one who teased you about wearing a wedding dress."

Kitty looked up and locked eyes with Jack.

Then all the lights went out.

"Fuck!" Jack yelled. "Emergency protocol 1! Complete lockdown!"

"On it!" Gwen cried. Jack spun back to Kitty.

"What the hell did you do?!"

"ME?!"

"Yes, you!"

"I didn't do anything!"

"Jack, she's stood right here!" Ianto protested, "How could it have been her?"

"I don't know, but…"

"Hub's locked down!" Gwen yelled over, fingers flying over her keyboard. "And the backup generator should be coming on any time…" the lights came on again, "…now." She finished, nodding.

"Let there be light!" Jack said, before turning back to Kitty and Ianto. "Ianto, get away from her, please babe."

"Don't tell me what to do, Jack. She's not dangerous!"

"Jack…" came Toshiko's voice quietly. Jack ignored her.

"I'm not saying she's dangerous, Yan, but we don't know anything about her!"

"You're judging her! For all you know she could have been alien all along! Would that change who she is?"

"If that was the case, why wouldn't she tell us?"

"Jack!" Toshiko said again, louder.

Gwen looked over and noticed she was looking worried. "Tosh? You ok?"

Jack looked round. "Toshiko?"

She looked up from her computer screen. "Jack, the backup generator never kicked in."

He frowned. "What're you talking about? There's light, isn't there?"

"The power never failed first time round. The lights were just turned off and on again at the fuse."

"Oh." Jack clicked his tongue thoughtfully. "Isn't that a good thing? Apart from the fact we're all locked in now of course…"

"Me, you, Martha, the Doctor, Ianto, Kitty. We're all stood here."

Jack glanced around. "Yeah, so?"

"So who turned off the lights?"

There was a tense silence in which everyone considered this, then several loud clicks as everyone, bar Kitty and the Doctor, pulled out a gun and clicked the safety off. Gwen looked over at Jack and Ianto.

"I don't even wanna know why you two took guns on your honeymoon!"

Jack grinned at her. "What, you never used a gun in fore…"

"Jack!" Ianto said warningly, and Jack shut his mouth and grinned cheekily at him. Then his eyes rested on Kitty and his expression grew sober.

"Jack." Ianto said again warningly, only there was no amusement in his tone now.

"Ooh; well, well, well!" said a voice from above them. Everyone froze. They all recognised that voice. "Looks like I've gate crashed a party!"

Everyone looked up, and Jack raised his eyebrows in shock. "John?"


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