A/N: This fic is co-written by Shke Behet and vanillaninja2032. Also, we know our science is off, so just humor us. Some of this is going to be more realistic than the show, as far as time differences goes, but other than that, we're going to try to keep it canon.

Troubles through Time

"Standard orbit Mr. Sulu. Lieutenant Uhura, authorize shore leave for all off-duty personnel." Captain James T. Kirk sat in his chair on the Enterprise as it entered standard orbit around Earth. It had been four years since any of the crew had been to Earth, and many were eager to visit their families. They were just ending a mission that involved the transportation of several ambassadors from newly joined Federation planets. Starfleet had granted the Enterprise a week of respite before returning to their mission. All of the crewmen that came from Earth had been abuzz since they got back, and no doubt the ship would be empty for the next week. Kirk leaned back in his chair, he himself wouldn't mind touching down briefly, but he was overseeing the restocking of the ships supplies while they were here.

Two levels down, Yeoman Janice Rand was headed to her quarters to pick up her things before transporting down to Earth. She double-checked her bags, making sure she had the gifts she had bought for her parents and sister over the time she had spent in space. As she exited her quarters she ran into her fellow Yeoman, Tonia Barrows. She smiled and fell in step with her.

"On your way down?"

"Yes, I just finished my duties on the bridge and the captain released me for shore leave." Janice smiled and nodded. Barrows and she had become friends after an away mission involving a capricious alien that tried wooing them at the same time.

"Yes, I'm looking forward to going home, it's been so long."

"I know, I'm looking forward to doing some shopping. What time are you meeting your family? I know a cute shop that sells the best coffee; you should join me for a cup."

"That sounds nice." They entered the transporter room together just as the last people were beaming down.

"Looks like you two are the last today." They stepped onto the transporter and waited as the transporter chief worked the controls. Suddenly, the lights flickered. Everyone looked at each other in bewilderment. The transporter chief looked down at the controls.

"Everything seems normal, energize." But just as the two Yeomen began to disappear, the lights flickered again. "What's going on? Stabilize them, quickly!" The junior grade lieutenant next to him quickly hit several buttons.

"Something's wrong sir, I'm losing them!"

"Dammit!" He pushed the man out of the way and quickly entered the emergency sequence that would hopefully bring the two Yeomen back to the transporting pad. Their forms shimmered in and out and finally solidified as they lights stopped flickering. The chief sighed in relief, but the lieutenant pointed at the transporting pad in alarm.

"Oh no."

Two Hundred and Fifty-Seven Years in the Past…

"And this is where Starfleet headquarters is supposed to be." A small brunette took pictures of the piers in San Francisco. "That's where the Bounty must have crashed in the Voyage Home." She pointed out into the bay area and almost hit her friend in her exuberance. Her tall blonde companion nodded.

"Cool, I never saw that."

"I've got it on DVD, we can watch it when we get home." The brunette put away her camera and strolled around, trying to imagine how Starfleet fit in with the surroundings. She and her friend had just finished their junior year of college and were taking a much needed vacation to the west coast.

"It's going to rain." She watched the black clouds roll in from the coast.

"Yeah probably." The brunette pulled out her camera again. "Let's get a picture of the Golden Gate before we leave. Excuse me sir, do you mind taking our picture?" She handed her camera to an old man and posed with her friend on the pier, the Golden Gate Bridge in the background. The old man took the picture just as a bolt of lightning struck, and they faded from sight.

"Oh no." The lieutenant ran forward and caught the girl before she hit the floor, her hand on her head in pain.

"What, did the flash not go off? Wait, where are we?" She looked over to see her companion standing next to her looking bewildered. "And what are you wearing?" Her friend didn't respond. She was staring in shock at, something. The brunette stood up and turned around to thank the nice Samaritan who helped her up, when her voice caught in her throat. The man looked normal, except that he was wearing a Star Trek security uniform. She looked down and realized that she too was wearing a security uniform, that is, the one for the female crew members.

"What the heck…." She jumped when she heard a voice boom through the room.

"Transporter, status." Nobody answered, the two men were staring at the two girls who were staring at the two men.

"Transporter room, respond." One of the two men reached over and hit a button on the wall.

"Yes, captain."

"Status?" The two girls didn't move. The man swallowed.

"We were in the process of transporting two personnel down to the surface when we had a power surge, twice sir. And when it stopped, two women appeared."

"Two women, Lieutenant?"

"Yes sir, where we were transporting down the other personnel. They're even in their uniforms!" There was a pause.

"I'll be right down. Run a diagnostic, then stand by."

"Yes sir." The lieutenant hesitantly turned his attention to the transporter. The two women had yet to move or speak. Everyone was in a state of shock waiting for the captain to appear. The brunette's eyes were sweeping the room. This looked like the transporter room from Star Trek. The voice sounded like William Shatner, and the technology worked the same as in Star Trek. The clothes she and her friend were wearing were the same from Star Trek. But she wouldn't even allow the thought to form in her head. She was not in the Enterprise; she couldn't be in the Enterprise. And that was not Captain Kirk that just walked into the room. Or Scotty, or Spock, or a random red shirt.

"What happened?" He stopped when he caught sight of the two girls, clad in the red dresses of his female security personnel. The taller of the two had long blonde hair, pale skin, and green eyes. She took a step back onto the transporter with wide eyes. Her dress was too short, and too tight across the chest, obviously the wrong size. The shorter girl had short layered brown hair, tan skin, and blue eyes. She just gaped at him in amazement. He held up his hands.

"I'm not going to hurt you. Can you tell me what happened?" Neither girl spoke. He grabbed his communicator out of his back pocket and flipped it open.

"Bones, get to the transporter room."

"What's wrong Jim?"

"Just get down here."

"On my way." Kirk flipped his communicator closed and attempted to get closer to the girls. The short one jumped back, terror and confusion written in her eyes. Whatever had happened, these girls were just as confused as he was.

"What's your name?" The girls eyed each other, silently communicating. It was the brunette that spoke first.

"Maddy." He looked at the blonde, trying to gain her trust.

"Lia."

"Pretty names. I'm Jim." Lia frowned and Maddy stared at him like he was an interesting animal that just did a trick. He turned to Scotty.

"Check the transporter, see what happened. I want to know where my crewmen are, and how these two ended up in their places." Lia patted her dress and looked to Maddy.

"If we're in their clothes, does that mean they're in ours?" Spock stepped forward.

"That may be possible." She started, as if she had forgotten there was anyone else in the room. At that moment, the door slid open to reveal an older brown haired man. McCoy.

"Now Jim, what's going….on." He caught sight of the two girls and stared. Lia lifted her chin slightly, she was uncomfortable with the attention they were getting. Maddy's mouth dropped open again. She felt a squeal build up in her, and she had to fight from saying anything and revealing her inner fangirl. She failed when a stray thought entered her mind.

"I'm in someone else's underwear." She was suddenly very uncomfortable and started pulling on the uniform. Everyone was staring at her and she was suddenly very torn between hoping this was a dream and wishing that she was actually here. Maybe if she was on the Enterprise in her own clothes it would be better.

"Jim, what is this?"

"I'll tell you Bones, just as soon as I know for myself. Spock?" The Vulcan folded his arms.

"It seems that when we were caught by that ion storm, it affected the transporter beam. While beaming down, it seems there was a….switch."

"A switch, Mr. Spock?" Spock walked up closer to the two girls, causing Lia to back into a wall.

"Yes Captain, likely these two young women were in the spot of the beam down, the ion waves altering the nature of the beam and switching them. I believe our personnel can be found on the transport pad in Starfleet command, alive and well except for the change of attire." He gestured to the dresses, which Lia pulled the edges of uncomfortably. She looked up and saw Kirk staring at her. She looked over at Maddy, who was staring at the whole room. She suddenly grabbed her wrist and felt her pulse, then rushed over and grabbed Lia's wrist.

"We're not dead! This is real, wait, I could be dreaming." She slapped herself, causing McCoy to snap into medical mode.

"What are you doing?" He grabbed her wrist to keep her from slapping herself again. "Why do you think you're dead? I never trusted transporters. Dang blasted machines, a human body's not meant to travel like that." He was examining her cheek where she slapped herself. She felt her cheeks heat up and was worried that McCoy would mistake her blush for a fever.

"Captain, something else is unusual about these two. They seem to have an unusual energy field surrounding them. If I am not mistaken, they are surrounded by a large amount of tachyon particles." Spock held his tricorder up as he read the numbers flashing on its screen.

"Tachyons, Mr. Spock?"

"Indeed. A possible effect of the ion storm mixing with the transporter beam. I must analyze this further." McCoy turned around.

"That's all well and good, but I need to get these two to sick bay, they're looking green around the gills. I need to make sure nothing altered them in the transporter." And indeed, Lia was looking paler than usual. She leaned against the wall and put a hand to her head.

"Oh, I need an Advil." Spock raised an eyebrow. McCoy began to lead Maddy out of the room.

"Advil?"

"A brand of pain inhibitor from the twentieth and twenty-first centuries."

"Spock, you don't think?"

"I don't know Captain. It would explain the tachyon particles." They both turned and looked at Lia, just as she stumbled. The security officer that came in with Kirk caught her before she fell. Kirk started forward himself.

"Take her to sick bay, we'll be there shortly." He nodded and helped her out of the room. Kirk turned toward Scotty.

"I need to know exactly what happened here Scotty. Mr. Spock, find the source of those tachyon particles." He left the room and headed up to the bridge to check their present course.

Meanwhile, Lia thought she was going to die. She was sick, nauseous, and dizzy. It felt like her insides were turning inside-out. She eyed the security officer beside her uneasily. She didn't know as much about Star Trek as Maddy, but she did know one thing. Red shirts always die. And as long as she was around the red shirt her life was in danger. She needed to get away from the red shirt before some alien came and decided to start causing trouble. The anxiety was almost as bad as the nausea. She let out a breath of relief once they entered the med-bay. She was safe for now. She was guided toward a red and gold bed and made to lie down, which she did gladly. A blonde woman in a blue dress hovered over her holding a small metal object that was giving off a whizzing sound. She watched her tiredly.

"What's wrong?"

"You're suffering from space sickness, is this your first time out?" She watched the nurse carefully.

"Yes." She nodded.

"I'll give you something to ease the symptoms. In a few days, you'll be up and about like normal." She took out a hypospray and grabbed her arm. Lia didn't resist her and she injected the hypospray. Almost immediately she felt better. Though she was still slightly dizzy, she no longer felt like she was going to throw up or faint. She sat up and smiled at who she recognized was Nurse Chapel.

"Thanks, where's my friend?" Chapel pointed at the other end of the room, where McCoy was holding up a similar whizzing device over Maddy and frowning. She walked over just as Maddy was speaking.

"Can I take my underwear off?" McCoy paused. So did Lia, before letting out a laugh. McCoy turned around.

"Feeling better? Nurse, what was her diagnostic?"

"Space sickness Doctor, I gave her a hypospray to ease the symptoms." McCoy looked distracted.

"Uh huh, do a full scan, will you Nurse? I'll need it on file."

"Yes Doctor, if you would." Chapel gestured back to the bed she had originally got up from and Lia went and lay back down on it, starting to feel uneasy. If this was real and she wasn't dreaming, they were bound to find something unusual. While McCoy's back was turned she mouthed to Maddy.

"What happened?" Maddy shrugged her shoulders and shook her head, indicating that she had no idea and was just as confused as she was. She lay back as the whizzing device examined her. She kept her face blank as Chapel frowned.

"Doctor-" But McCoy cut her off.

"Get these vaccines ready Nurse, I'll be right back." He handed her a data pad and headed toward the door, just as it slid open and revealed Kirk and Spock.

"Bones, are those two up to talking?"

"Physically they're fine Jim, some space sickness, nothing that can't be dealt with, but…"

"But?"

"But some of these readings I took just don't make sense."

"How so?"

"Their bodies are different. Everything's where it should be and works the way it needs to, but some minor things are abnormal."

"How so Doctor?"

"They have a higher bone density, and anti-bodies to diseases that haven't existed in hundreds of years. They have zero anti-bodies to diseases that are commonly vaccinated against now. Vaccines that are required at a young age. Not to mention some maladies that should have been cured years ago. It just doesn't make any sense, and it's not just one of them it's both."

"Interesting. Your readings match with a theory I have formed." They both looked toward the Vulcan.

"When the two Yeomen beamed down, it coincided with a large ionic wave that swept through the ship, changing the nature of the beam. Instead of simply transporting through space, it transported the Yeomen through time as well. In the exact spot where Starfleet command's transporter pad stands in San Francisco, these two were standing more than two hundred years in the past. My theory is that an unusual amount of ionic waves must have been in that area at the same time, and connected through time, switching the forms of those transporting into each other's places."

"So you're saying my two Yeomen are now in the past." Spock nodded and Kirk stared at the two young women lying on the two beds.

"Can those conditions be simulated?" Spock shook his head.

"The ionic waves must appear in both places Captain. Though we could simulate them here, there is no way we could simulate them in the past."

"So all four of them are stuck in time periods where they don't belong."

"That is correct."

"Well that just sucks for us." They looked over and for the first time noticed that the girls were paying attention to them. Maddy was sitting on a bed and waving her arms around. "I mean that really sucks. We can't be in the future. What the hell are we supposed to do? I left my credit card there." Lia stared at her.

"Who cares?" She gestured to the room at large and Maddy nodded.

"You're right, they don't have credit cards here. Can I have pants?" Kirk and Spock looked at each other, and McCoy grabbed a hypospray.

"These two need to be quarantined until they've been vaccinated. Anyone who's touched them will need to be inoculated again as well." Kirk nodded.

"Do it, how long will they need to be in quarantine?"

"Twenty four hours." Kirk caught Lia's eyes and she watched him warily. He inclined his head.

"Then until tomorrow ladies. Bones, contact me as soon as it is safe for them to leave quarantine." He nodded to Spock and the two of them left the room. McCoy and Nurse Chapel each were holding several hyposprays.

"You'll feel several mild side effects that may conflict with your space sickness, therefore I'm going to sedate the two of you." Panic appeared in Lia's eyes for a moment, then died down. Maddy nodded.

"Okay." For the next several minutes the girls were inundated with a flood of vaccines for everything from the space flu to Klingon chicken-pox. No vaccine for the common cold though, they still hadn't discovered that.

"I feel like a pincushion." Lia moved her arms, trying to work the soreness out of her system.

"Ditto." Maddy slumped on the bed. McCoy had isolated them in the sick-bay and was currently inoculating himself and everyone else they had come in contact with. For the first time since they got there they were essentially alone. "What now it's not like we can tell them they're a TV show."

"They're not or we wouldn't be here, but if we don't tell them something, we might slip up and they'll think we're liars."

"No way, that's a really bad idea. They'd never believe us."

"We have to tell them. The stuff we know could be a liability."

"And it could alter their future if they knew we knew."

"But the show ended after three seasons. We don't know anything after that until the first movie, so if we should find out what year it is if it's after the three years we have nothing to worry about. We should at least tell Spock."

"Who would tell Kirk, because he would be duty bound."

"The two of them should know because otherwise they'll be trying to send us to the past, not a different dimension." Maddy sighed, Lia was right they had to tell them what they knew.

"Okay, we tell Spock in the morning." Lia nodded her head in approval and leaned back on the bed as the sedative overpowered her and she fell asleep.