Prologue : Peri's POV

Stuck! In the TARDIS! Again! Peri couldn't believe it, honestly, did the Doctor think she was some kind of kid who couldn't keep up with him, or listen to what he said or something.
It'd now been two hours since the Doctor had rushed out of the TARDIS, coat flapping along behind him, shouting over his shoulders about how he 'shouldn't be long' and that she should just 'stay there' and Peri was bored out of her mind. She was also rather worried about the ridiculous guy, after all what if he ran into some alien who had promptly kidnapped, or worse killed, him? What would she do then? She couldn't fly the TARDIS and she was fairly sure that, while it was sentient, the old blue police box couldn't fly itself.
She sighed, and thought ruefully to herself 'Sorry Doc, but for once I'm gonna have to be the one to get you out of trouble.' With that thought in mind, she walked around the console and pulled the big red lever that opened the doors. They slid open and Peri grinned at what she saw outside.
What she had expected to be an alien planet was in fact a small rural village, in what she assumed to be England because there definitely weren't any places like this in America. All around her were farmers and sweet looking old ladies, it almost looked picturesque. The houses were neat and tidy, there was no litter and even the air smelled clean. 'Well one thing's for sure' she thought 'There's no way this is anywhere near the eye of Orion', which is where the Doctor had been planning to take them when they'd first got the weird readings.
Peri shook her head it was no use thinking of what they could have been doing. Right now all she had to concentrate on was finding the Doctor. Surely it couldn't be too hard, it's not like there would be two cute blond guys running around all over the place and besides that fact, the Doctor stood out from a mile away, so there's no way she could miss him.
Just as she was thinking this she saw a familiar blond head walk past and she grinned, before remembering that she was supposed to be angry at him. So scowling she walked up to him and tapped him on the shoulder, saying in her most irritated voice.
"Don't you ever do that to me again or I swear I'll kill you myself." The figure turned, looking confused, before he gave a boyish grin,
"Me?" he asked "Do something horrible to you? I wouldn't dream of it once, let alone again!"

Tristan had to admit it wasn't the most usual conversation starter he'd ever heard. But then, nothing about the young woman scowling darkly at him struck him in any way as 'usual' or 'normal'. He gave her one of his brightest smiles over the bottles of Universal Cow Medication in his arms. Whoever she was, she didn't seem too impressed by his charm.
"Oh really?"
The sarcasm was thick enough to spread sandwiches with. Well, she was clearly an American, the accent was unmistakable. Not exactly dressed like most of the young ladies in Darrowby either, though Tristan gave his full approval to the shorts and tight shirt she had on. He wondered what she was doing in the heart of the sleepy British countryside; there wasn't exactly much glamour or excitement here.
At least she had good taste though, Tristan decided and made a mental note to keep her away from Siegfried, he'd spotted her first! He shifted the bottles in his arms.
"What is that stuff anyway?" She said, peering at the stoppered bottles filled with thick crimson liquid.
"Oh, just some excess medication. Let me just put it back in the surgery and I'll be ready, willing and able to assist you!" He tried another boyish grin. Still no effect. She shook her head vehemently.
"Like I'm letting you out of my sight! I've been waiting hours for you!"
"Hours? For me? I'm flattered!" Tris started back to the surgery, the peculiar but attractive American following closely. Her high heeled shoes were giving her difficulty on the uneven pavement. Tris solicitously lent her an elbow which she accepted with an air of slight puzzlement. Well, his opinion of American men was going down, didn't they know how to be chivalrous?
They arrived at Skeldale house and Tristan was surprised when the girl followed him straight into the surgery, she was taking the whole 'not letting him out of her sight' fairly seriously then! He put the bottles in the cupboard and turned to his guest, who was examining the equipment with open curiosity.
"What's this for?"
"Oh, dehorning young calves."
"It looks very heavy."
"It is! Takes strength and determination to use this lot!" He grinned at her again and she rolled her eyes at him, smiling.
"Of course." She changed tack. "Where have you been anyway?"
"Where have I been? What, today?" He frowned, had she been expected him? She certainly was acting like they'd made arrangements, but Tris was positive he would have remembered meeting such a striking American girl before! Had she confused him with Siegfried? No, she'd recognised him by sight…ah well, no harm in going along with it! "Just up to Hill Farm, Tamfern's rather worried about some of his cows there."
"Have they been acting oddly then?"
"No…just a touch of milk fever. Look, do I kno-"
Tristan was interrupted just then as Siegfried breezed in. He dropped his bag off on the table and turned to see who Tristan was talking to. He did a double take at the sight of the strange American girl, before switching to his most charming manner.
"Hello, my dear. Who are you then? Can I be of any help?"
"Oh, hi, I'm Peri. Sorry, is this your surgery?"
"Yes, mine, my brother's and my partner's. Peri. That's an unusual name, American is it?"
"Yeah, short for Perpugilliam." She seemed charmed by his brother thought Tris sourly, though at least he knew her name now. Peri. Peculiar but it seemed to suit her anyway. He cleared his throat pointedly.
"Don't you have that calving to head to Siegfried?"
"Actually, I just came to ask if you would mind taking it, I've just got a phone call from James, he's got a horse he needs a second opinion on."
"What? But Siegfried!"
"Must dash!" Siegfried swung out of the room before Tris could protest further. He sighed.
"Sorry about this Peri, I'll have to take the job, it sounded pretty urgent. Will you be alright here? I'm sure Mrs Hall could make you some tea or something."
"Can't I come with you?" Tristan blinked.
"Well, if you want, I suppose. I'm sure it won't be very interesting though."
"Oh that's alright. Besides, I can't wait to see you trying to deal with an angry cow!"
"I've dealt with plenty of angry cows in my time!" He said amusedly as he gathered up the needed instruments.
"Sure you have, Doctor!"
"Veterinary, doctors are for humans, remember?" For some reason that made her laugh. She had a nice laugh, he decided, even if her sense of humour was rather bizarre. "Come on then, I'll give you a tour of the Dales on the way!"
"I thought you said it was urgent?"
"There's always time for admiring beauty!" He grinned, making sure to look at her pointedly as he said that. She frowned, looking confused. Good grief, didn't American men give out compliments either? Idiots. Well, it was to his advantage he supposed.
She wasn't too impressed by the car, commenting on the slow speed and the general mess of the interior. He pointed out that it was a vet's car, odd smells and stains were, sadly, par for the course. Though when he got his own car he was determined to treat it a little better than this one had been!
They had just passed out of the village and were headed into the true Dales when a black clad figure appeared from nowhere. Tristan slammed on the brakes, coming to a halt just inches from the man. He leapt out of the car furiously, was the man trying to get them all killed?
"What the devil do you think you're playing at!"
"Ah, there you are Doctor. I've been looking for you; I didn't think it would take this long for you to get yourself involved."
"What? Involved?"
"You." Peri said, appearing by Tris's side. "Didn't you burn to death or something?."
"And the delightful Miss Brown with you as well. Dear me Doctor, you are getting predictable." Tris could only stare in bafflement as Peri and the stranger glared at each other.
"Erm, sorry but-"
Tristan never got to finish his sentence. The black clad man raised his hand, there was a flash of silvery light and then everything went very dark.

Peri? Peri…Peri, are you alright?" The Doctor's voice pierced through the darkness.

Peri groaned and turned her head mumbling incoherently, "Go away Doctor."

Apparently he didn't understand her, as he had now place his hand on her shoulder and shook it gently, saying in an anxious voice "Peri, come on. Please. Open your eyes."

She groaned again, this time more audibly and slowly started to open her eyes, her eyelids flickering slightly as they did so. This action though, caused a sharp burst of pain to hit her right temple and she winced, hissing as she did so. Her hand shot up to clutch at her head and she shut her eyes tightly, hoping to clear the pain and be able to focus properly. Slowly she tried again, her eyes opening just a fraction and feeling no additional pain, she opened them fully and took in her surroundings. She seemed to be in some sort of cell like room, which actually looked vaguely familiar, but she couldn't put her finger on it. Above her though was a familiar sight, the Doctor was looking down at her wearing an expression of deep concern.

"Are you alright Peri?"

She nodded and winced again, a faint twinge of pain passing through her head again. "I'm fine. But w-where are we?" she asked, her voice rough, as if she had just woken up.

"Haven't a clue," he replied scratching the back of his neck and shrugging. "I've only just woken up myself. All I can remember is that man in black stopping the car when we were on our way to deal with that calving and after that everything is just blank I'm afraid."

Peri slowly started to sit up and the Doctor slipped an arm around her waist to help. She smiled gratefully at him, rubbing at the side of her head thoughtfully. A man in black? Yes, she could remember it now but that wasn't any random guy dressed in black, that was "The Master!" she exclaimed out loud.

"Yes, I think that's what he said his name was."

"You think? Doctor the guy's your worst enemy and if I can remember exactly who it was, I'm pretty sure you can. I mean you've met him like fifty times already." Peri said, looking at the Doctor with a confused expression, which he returned.

Peri turned away from him, what was wrong with him. The Doctor had been acting weirdly ever since she had found him earlier on.

Firstly, there had been what she was sure was flirting, which admittedly wasn't so bad, after all she did think the Doctor was cute. But still it was totally out of character for him seeing as generally he was about as flirty as a rock and definitely as oblivious as one.

Second, there had been all that nonsense about being a vet and all the "I've dealt with angry cows before". That definitely couldn't be true, unless of course there was a planet of angry alien cows that looked exactly like earth ones.

Thirdly, there was all that banter with that other guy, oh what was his name, oh yeah, Siegfried. Anyway, the two of them had argued like they had known each other their whole lives, it was almost like they were brothers or something. She frowned, now that she knew was impossible, the Doctor had told her about his brother, apparently he was called Irving Braxiatel ("Brax for short Peri") and he was a Time Lord who lived on Gallifrey. Not a somewhat handsome British vet who happened to be extremely charming.

The fourth odd thing was the way he seemed to know his way around, he had genuinely known the exact route to take, and had even wanted to take her on a tour. There was no way he could've learnt how to navigate through the entire countryside; heck he couldn't even fly the TARDIS from one end of space to the other.

And now, there was this, not even recognizing his self proclaimed worst enemy. Something was definitely wrong with the Doctor, unless…

She looked at him again. He was slumped against the opposite wall, looking around the room curiously, as if he'd never seen anything like it before. He looked completely lost, like he didn't have a clue what was going on or how he'd ended up here in the first place. Obviously sensing her gaze he turned towards her, once again showing that boyish grin. Peri rolled her eyes, as cute as it was, she didn't have time for flirting British guys, because she knew that that was who he was.

She stood up and walked over to him, causing him to positively beam at her, and sat down next to him. He was just about to say something; most likely flirtatious if the grin was anything to go by, when she cut him off. Looking him dead in the eye she whispered "You're not the Doctor are you. You're the brother Siegfried mentioned, the other vet."

As he nodded Peri sighed. 'Well, this is great,' she thought sarcastically 'I am stuck. In the Master's TARDIS. With a guy who looks exactly like the Doctor.' She let her head fall back against the wall and gazed hopelessly at the ceiling and ignoring the curious looks the 'not Doctor' was giving her, she groaned in frustration. She was stuck inside another TARDIS, and this one she couldn't escape from on her own.