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Rose approached her double with caution. Donna, the Doctor and Jack held back, watching the blondes study each other.

"No...no way. That's..." Rose croaked. Her double stared, her mouth gaped open in disbelief.

"My god...you look jus' like me!" Her double caught her breath. "Are you..are you my twin? Were we separated at birth, or somethin'?"

Rose glanced at the Doctor for recognition. He stepped forward with a grin and thrust a hand in-front of the double's face. She shook it and returned the smile. Rose felt uncomfortable and cleared her throat. She arched an eyebrow at the Doctor.

"Oh, right, sorry! I'm the Doctor, by the way, I travel with Rose. This is Donna and Jack," The Doctor motioned to his friends, who proffered a wave. "Uh, to explain this situation, we're from another universe. I don't know how, but we've fallen through a gap in time, to end up here, in your universe. It's kind of impossible, to fall into another universe, in case you were wondering. Well, obviously not as impossible as I'd thought. Very unlikely, though."

"So..you're an alternate me?" The double looked at Rose.

"I guess you could say that," Rose agreed. Her double fished through her bag for her phone and held it to her ear.

"I've heard about this alternate universe thing before. I'll 'ave to tell Dad, he'll love to meet you all-"

"Dad?" Rose interrupted, "You mean...Peter Tyler?"

"Yeah, that's 'im. But you'd know that, I suppose, wouldn't you?" Her double laughed, pressing the keypad and pushing the phone to her ear. The Doctor glanced over at Rose, his face etched with an uneasy expression. She averted her eyes away and scuffed her trainers on the pavement.

"This is weird. Two Rose Tylers!" Donna hissed in Jack's ear.

"It's the Doctor's dream come true!" He grinned, as Donna snickered and touched his arm fondly.

"I'm not sure Rose agrees," She observed, keeping an eye on their friend. As her double and the Doctor chatted down the phone to Pete, Rose was cast aside, gnawing on a hangnail. "I feel bad," Donna groaned.

"Yeah, but what can we do about it? Besides, even if the Doctor is flirting with this woman, at least she looks and thinks exactly like Rose. That's a bonus," Jack reasoned. They fell silent as the double flipped her phone down and slid it in her pocket.

"Right. You lot up for a trip down to Torchwood?" She announced.

"You work for Torchwood?" Jack's eyebrows flew up in surprise.

"Yeah. My dad owns it, so it's heredity, really."

"You dad owns Torchwood? Wow," Jack exhaled a breath, "I work for Torchwood. In my universe. I'm the leader, like your dad."

"I'm sure he can't wait to meet you, then. His favourite thing to to is to spend hours talking Torchwood jargon, he'll love havin' you around!" The double adjusted her blouse and ran a hand through her hair. "Torchwood is top secret. So, before we go anyone, I'll jus' give you a warnin'. If you're lyin' to us, we'll find out. Don't ask us how, 'cause we won't tell you. If we find out you haven't been truthful, then you'd better watch your back. Got that?"

"Yes ma'am," The Doctor beamed.

"This way," The double set off down the road after eyeing the four strangers carefully.

"You alrigh'? You've been quiet the whole way here," Donna gently prodded Rose's side. Rose snapped into life and widened her eyes. "Rose?"

"Oh, sorry. I was jus' daydreamin'."

"I gathered that much. This is really weird, you know. Another world. It's like a movie!" Donna's eyes darted around the London street. "But I suppose you'd be used to it by now. This isn't your world, is it?"

"No. My world had Zeppelins in the sky. This is another world. A foreign one," Rose mused. Donna surveyed Rose with apprehension. The blonde was staring ahead, watching her double, Jack and the Doctor chatter away. "Very foreign," She added.

"Rose, don't worry about 'er. She hasn't got a patch on you."

"But she is me! She's me, but a more successful me. She's got the parents, the job, the money, everything. Probably got a gorgeous boyfriend to top it all off. And what have I got?"

"You've got the whole of Time and Space, all these different universes, it's all waiting for you. You've got me and Jack. You've got the Doctor. She hasn't," Donna reminded her softly. A smile tugged at Rose's face.

"Yeah. 'Suppose you're right," Her face dropped, "But the way she's goin', I'm sure she'll be travellin' with us in no time," Rose responded bitterly.

"Don't say that."

"But it's true! Yeah, I have my parents, and Tony, but I can't ever go and see them again, can I? I made my choice a long time ago."

"I know this must be hard on you, bein' in the wrong world and all that. But I swear, the Doctor thinks the world of you, Rose, honestly. He adores you, not her," Donna replied, her tone laced with sincerity. Rose paused.

"Maybe."

"Oh, Rose, get a clue, will you!?!" Donna cried, exasperated. Her outburst caused Rose's double to stop in her tracks and look over at them.

"Clue 'bout what?" She asked innocently.

"I was talkin' to this Rose," Donna jerked her finger in Rose's direction. Her double nodded, recognising Rose and Donna's need to talk in private. She turned back to the men and strode off once more. "That was close," Donna exhaled an alleviated sigh.

"I don't feel comfortable with her around. Like...I'm bein' constantly followed by a mirror. A mirror that shows me everythin' I'm not."

"Rose," Donna grabbed her shoulders forcefully, "In that parallel universe, you did the impossible. You made it back to him. He's a Time Lord with a travel machine, and you're...well, no offence, but you're jus' a human. And yet you overcame the odds and did it! And that's amazin'. Bloody amazin'. So shut up, stop feelin' sorry for yourself, and show that 'mirror' that you mean business!" Donna ordered.

"I can't argue with that," Rose smiled wryly. Donna dropped her hands and reciprocated the grin.

"No, because I won't let you," Donna pushed an arm through hers as they giggled and sashayed down the road.

"Right then. Donna, Rose, stay here. Jack and I'll go with this Rose and meet Pete Tyler. Then, hopefully we'll find a way out of here, got that?" The Doctor declared.

"Great plan, apart from us stayin' here. Why should we have to wait here while you go gallivanting off?" Donna questioned irately.

"Uh, because Rose looks exactly like the boss's daughter. Go back to the TARDIS or something, just don't hang around here," The Doctor explained distantly. Donna still didn't buy it, spinning her eyes to the ceiling in disdain.

"We've just walked all the way from the embankment to Canary Wharf, we're not goin' back now!"

"Rose? That you?" Pete's voice drifted from another room.

"Yeah, it's me, Dad, I'll be in in just a tick!" The double replied, before ushering Rose and Donna in the direction of the door, "Right then, Doctor, Jack, you ready to meet my father?"

"The Doctor already has," Rose indicated sharply.

"Oh, sorry. Whatever," Her double wafted a dismissive hand. Donna gritted her teeth together, clenching her fists.

"C'mon, Rose. Let's trek back to the TARDIS," Donna tugged on Rose's arm sullenly.

"I'll see you back in the TARDIS, OK?" The Doctor assured them with a smile. Jack waved a friendly hand at Donna, who was still sulking. The Doctor approached Rose and touched her cheek. "I'm sorry for doing this. But I just want you safe. Stay out of trouble. I don't want you to be dragged into any deadly missions."

"I could handle it," Rose protested with a pout.

"Oh, I wouldn't doubt you. It's the opposing side I'd be worried about," He teased, enveloping her into a hug. Rose rested her head against him tenderly, stroking his hair. "I'll be back before you know it."

"You'd better be."

"Oh for gods sake, you'll be apart for an hour!" Donna smirked as the couple drew apart.

"Rose?" Pete called again. Donna could feel Rose hesitate, so she pulled her through the door. Pete strolled into the room, a smile bursting upon his face as he caught sight of his daughter. "There you are! Where've you been? You shift started ten minutes ago!"

"I was just takin' the long walk here. But you'll never guess who I've brought with me!"

Donna and Rose peered their heads around and watched the Doctor, Jack, and Rose's double disappear into Pete's office.

"He looks exactly the same," Rose mumbled.

"Who?"

"My dad. Down to the same haircut, if you can call it that," She smiled warmly, her thoughts with her family. "Anyway. Are we gonna go back to the TARDIS then, see if we can get out of here?"

"It took us almost an hour to walk here. I'm not going back," Donna justified.

"But the Doctor said-"

"He said stay out of trouble. Which we will do. Just...we'll walk around here for a bit, wait until they've finished their little meeting," Donna held the door open to Rose, who entered the reception cautiously. Donna joined her with a satisfactory beam. "Lets go searchin'!"

"Rose? Rose!" Jackie stomped into the building. Rose couldn't help but grin when she saw her mother. "There you are! I need to speak to your father, d'you know where he is?" Rose was momentarily speechless as she gazed at her mum. "Rose? Earth to Rose?" Jackie turned to Donna, "Is she alrigh'?"

"Oh, sorry, Mum. I think Dad's in his office with some people. He doesn't want to be disturbed, that's what he said," Rose managed to reply. "How's Tony?"

"Who's Tony?" Jackie frowned.

"You...you don't know who Tony is?" Rose rasped.

"No, I don't, love. Is 'e a new boyfriend?"

"It doesn't matter. Anyway, how've you been?"

"Me? I've been alrigh'. You sure you're alrigh'? You seem...I dunno, a bit spaced out or somethin'," Jackie scrutinized.

"I'm fine. Just tired, the late nights catching up on me," Rose rubbed her eyes for extra effect. Jackie nodded, not seeming to believe her fully.

"Oh, I just remembered! We've got that party tonigh', you got your dress ready?"

"Uh, yeah-"

"Good! I'll see you later, tell your father I came, will ya?" Jackie pecked Rose's cheek, before leaving them in a puff of perfume and vanilla essence. Rose and Donna stared after her.

"That's your mum?"

"Not really. Not my world, remember?" Rose reminded her.

"You know what I mean!"

"ROSE!" A man hurdled into view and almost knocked the blonde off her feet. "You've got to come quick-"

"OI, get off her!" Donna screeched, but the man was already dragging Rose away.

"There's an emergency downtown. You've gotta come quick," The man shoved the door open and pushed Rose out.

"Steady on!" She griped, whacking her elbow on the door.

"I'm sorry, Rose, for being so uptight, but it's an emergency-"

"Can't we just wait for my dad?"

"He's in an important meeting, not to be disturbed," The man threw the van door open as Rose jumped inside. She could hear Donna's objections, but the man had slammed the door before Rose could escape. The van started up, and soon the Torchwood building faded into the distance.