A/N: Hi! I felt I had to put this up, so that you would have something to read until I update my other fic "Not all changes are for the worst...".

This is a fic which I came up with when I listened to a (excellent) rock version of the theme for Star Trek: Deep Space Nine. I know, I know, it's not a DS9 crossover, but that's only because I don't know that series that much as I know Next Generation and Voyager. Plus this would really fit better in one of those series than in DS9, since DS9 is...well...not explorers. This fic is supposed to take place during Harry's 6th or 7th year, I haven't really decided, and it has some connections with my other fics, in the sense that the character of Lynn Walsh is in it. Therefore I recommend that you read my fic "Entering a new world" before reading this one, since it introduces Lynn as a character. Plus, you should at least know who the characters in "Star Trek: The Next Generation" are, but it's not required. The fic is just more fun that way. Well, stand by and we'll beam you up...er...I mean....read and enjoy!

Spoilers: All books, to be on the safe side, plus minor spoilers for my main fic "Not all changes are for the worst...".

Disclaimer: Harry Potter belongs to J.K Rowling. Star Trek belongs to Paramount Pictures and, of course, Gene Roddenberry (R.I.P.), The Great Bird of the Galaxy. Although, Lynn is all mine (I never get tired of writing that ^_^).

Rating: R. Mostly PG-13, but there's some holodeck stuff that needs the R.

"What the hell is a tricorder?" - A Harry Potter/Star Trek crossover fic

1. New arrivals on the Enterprise

It had been quite calm day on the Enterprise, no Q, no Klingons (except for Worf, of course), Romulans or such. No sensor distortions, no malfunctioning holodecks, no crew members out of phase, no...well, no nothing, really. And quite honestly the crew of the Enterprise deserved a little break. Commander Riker was of duty and down in Ten forward, enjoying a light drink. He was sitting alone at a table, when Guinan came over.

"Something wrong, Commander?" she asked. Riker looked at her, not quite looking relaxed.

"No," he said. "No, everything's fine." He looked down at his drink. " Just enjoying my drink here."

"No, tell me, what's the matter?" said Guinan, not at all convinced by Riker's response. She sat down in the seat opposite Riker. Riker looked around the room.

"I don't know..." he said. "It just seems a little...calm." Guinan raised an eyebrow, since the room was rather full of people, not many tables empty. "No, I don't mean here. I mean the whole ship. We haven't encountered something out of the ordinary for weeks now." Guinan chuckled.

"Felling a bit restless, Commander?" she said, and smiled. "Try to get used to it, I'm sure that even this crew deserves a brake now and then."

"Yeah, you're right. I guess it's this ship. You get used to things to happen. But I still have a feeling that something...something is going to happen soon..." Just after he finished the sentence there was a loud pop, and four people fell down out of nowhere onto the floor in front of the bar. "...And there it is." Riker put down his drink. He and Guinan got up and walked down to the four people on the floor. On closer inspection it turned that it was two boys and two girls, all four of them about 16 or 17 years old, all four unconscious. The boys were one with jet-black, untidy hair and round glasses, and one with fiery red hair, the girls were one with bushy, long, brown hair and one with neck-length bronze hair. Riker tapped his communicator.

"Riker to sickbay," he said.

"Sickbay here," answered Dr. Crusher's voice.

"We've got four guests in Ten forward, they're unconscious."

"Riker, if this another drinking bet, I swear I'm gonna.."

"With guests I mean uninvited guests, doctor."

"Okay, I'll come right away, Crusher out."

"Who are they, doctor?" Riker asked. Dr. Crusher was scanning the guests with a tricorder.

"Well, I can tell you one thing for sure," said Dr. Crusher. "They're human. But they don't seem to be from our time."

"What do you mean not our time?"

"From what I can see they're at least from a couple hundred years ago." The door opened and Captain Picard and Lt. Commander Data came into sickbay.

"What have you found out about our guests, doctor?" Picard asked.

"They're human, and seem to be from at least two centuries ago," the doctor answered.

"Time travel?" Picard said.

"It seems so," said Dr. Crusher. Picard walked up to the bed where the boy with the red hair was lying. He looked at the black robe the boy was wearing.

"Gryffindor..." he read of the patch on the robe. He then saw something else in smaller writing on the patch. "Draco dormiens nunquam titillandus..."

"Latin," said Data. "It means 'Never tickle a sleeping dragon'."

"A sound advise," said Picard. "I wonder...It seems like a motto, perhaps a school motto. These youngsters seem too be the right age for it." He looked at Dr. Crusher. "Is it safe to wake them?"

"Yes, there's nothing physically wrong with them," the doctor answered.

"Do it," said Picard. Dr. Crusher took a hypospray and used on all four of the "guests". They came to rather quickly. Dr. Crusher leaned over the girl with bronze hair.

"It's alright," the doctor said, and then glanced over at Picard who nodded. "This is going to be hard to believe, but your on a starship, the-"

"...NCC 1701-D USS Enterprise," the girl finished, speaking with a British accent.

"Well...yes..." said the doctor, a bit stunned that the girl knew exactly were she was.

"And you're Doctor Beverly Crusher," the girl continued. She now sat up and looked around the room. "You're Captain Jean-Luc Picard, you Commander William T. Riker, and you're Lt. Commander Data." She said this to everyone in order.

"Yes, that's right..." said Riker.

"Allow me to introduce myself," the girl said. "I'm Lynn Walsh."

"I'm Hermione Granger," said the girl with the long and bushy brown hair, also with a British accent.

"I'm Harry Potter," said the boy with the jet-black, untidy hair and glasses, he too had a British accent.

"And I'm Ron. Ronald Weasley," said the boy with the fiery red hair, also with a British accent. He looked at Lynn. "Lynn, can I ask you something?"

"Yes, Ron?" said Lynn.

"How did you know were we are? I mean..." He looked around the room, seemingly confused. "...I don't have a faintest idea of what this place is, except for what you just said."

"I think we all would like to know that," said Picard and looked at Lynn. "But for now I would like to know where you're from. The doctor tells me that you seem to be from at least 200 years ago." Ron went pale.

"Wha...? Two...hundred....years?!" he stuttered. "What year is this?"

"Earth year 2366," said Riker. Ron went even paler.

"But that's...that's impossible!" said Ron.

"On the contrary," said Data. "Time travel has been performed on several occasions. For example-"

"Data, now is not the time," Picard interrupted. He tapped his communicator. "Counsellor Troi, report to sickbay immediately."

"To answer your question, Captain Picard, we are from the late 1990-s." said Lynn. "I can't remember the exact year... The journey here must have done something to my memory..." Dr. Crusher scanned Lynn and the others with the tricorder again.

"She's right," said the doctor. "Their memory is damaged, but it seems to be some minor damage, nothing serious. It'll all come back to them in time."

"What is that?" asked Hermione curiously. "That thing you're using."

"This?" the doctor asked, holding up the tricorder. "This is a medical tricorder." Troi now entered the room.

"What the hell is a tricorder?" said Ron.

"They use them to scan for things," said Lynn.

"How come you know so much about us?" Picard asked.

"I'll get to that, but first..."said Lynn and looked at the others. "...I think we'd better tell you who, or what, we are."

"What do you mean with 'what'?" said Riker. Lynn took a deep breath. Then she looked straight into Picard's eyes.

"This is going to sound a bit crazy, but..." said Lynn. "...We...are witches-" Ron cleared his throat. "-and wizards in the boy's case."

"Thank you," said Ron.

"When I say that I mean that we are REAL witches and wizards," Lynn continued. "The wizard world has long been kept a secret from 'normal' people, whom we call muggles, by certain spells and barriers. We four are students at the only wizard school in Great Britain...or at least it was called Great Britain then...anyway, our school is called Hogwarts School for Witchcraft and Wizardry. It has four school houses, Rawenclaw, Hufflepuff, Slytherin..." She said 'Slytherin' like it was disgusting to say. "And then there's-"

"Gryffindor," said Picard.

"How did you know that?" said Lynn, surprised. Picard smiled.

"The patch on your robes," he said. "It says Gryffindor."

"Oh, well, duh..." said Lynn, feeling a bit stupid. "Didn't think of that one..."

"That's you, now..." said Picard. "...how do you know all about us?"

"We don't," said Ron.

"Oh, Ron, you numbskull!" said Hermione.

"What?" said Ron.

"Lynn knows about them," said Harry. He looked at Lynn. "Right?"

"Yes," said Lynn and nodded. She took a deep breath. "Hermione, Harry, did you ever see a show on TV called Star Trek: The Next Generation?"

"Yes..." said Hermione

"Yeah, I saw it 'bout once or twice," said Harry. "Before Dudley got tired of it, since you actually had to think to watch it." Hermione now seemed to have come to think of something. She gasped, and then clasped her hands to her mouth. Although, Harry didn't notice this. "I rather liked it though. I try to catch the reruns now that I live with-"

"Harry! Don't you get it?" Hermione interrupted.

"Get what?" said Harry, not at all understanding what Hermione meant. But after a few seconds his eyes went wide. "Are you saying...that these people are those people? I mean, that this is THE Picard? THE Riker, Data, Troi and Dr. Crusher?"

"Yes," said Lynn.

"How is that possible?" said Harry.

"I don't know..." said Lynn.

"I do," said Hermione. Everyone in the room looked straight at Hermione. "I've read about a thing that with you can look at the future, or the past, with. I don't remember what it's called, but the thing is that someone must have used it to look into the future, and they probably came upon the travels of this ship. They then used it for a TV-show."

"Are you saying that in your time, we are...entertainment?" said Picard.

"Yes," said Lynn. "And that's how I know so much about you. My brother is a Trekker and so am I, although not as much as he is."

"Trekker?" said Riker.

"Its what fans of the 'Star Trek'-series are called. Well, at least the NON- fanatic fans." said Lynn. "The TV-show that tells the story of your travels are called 'Star Trek: The Next Generation', and it's the second 'Star Trek'-series. The first covered the travels of the original starship Enterprise, James T. Kirk's ship."

"Amazing..." said Picard. "But do you know how you got here?"

"Perhaps, a time-apparation," said Hermione. "I've read about them, it's really rare, but certain spells can trigger a time-apparation, and if powerful enough, send people centuries from their own time (A/N: I'm SO making this one up, but I have to explain it somehow!)."

"Apparation?" said Riker. "What's that?"

"It's the wizarding worlds version of your transporter, only you do it your self," said Lynn. "When it's performed there is a certain scent in the air."

"Now when you say it..." said Riker. "When you arrived, in ten forward, there was a strange scent."

"So, therefore, it probably was a 'time-apparation' that brought you here," said Picard. "Number one, Data, counsellor, come with me." Picard, Riker, Data and Troi went out of the room. Once outside Picard turned to Troi.

"Well, counsellor?" he said.

"They are speaking the truth, or a least they think so," said Troi. "Other then that I sense that they are all a bit uneasy, except for the girl..."

"Lynn? What about her?" said Riker.

"She seem to think that everything is under control," said Troi. "In fact...she is a bit excited...she's enjoying this. Other than that I detect feelings of angst, remorse from the boy called Harry."

"No indications of them being dangerous?" said Picard.

"No, not at all," said Troi. Picard now turned to Data.

"Data, they claim to be witches and wizards. Do you think there's any truth to it?" said Picard.

"Perhaps," said Data. "There have been signs of a 'wizarding world' over time, but nothing substantial. I will have to investigate it further.

"Do it, start at once," said Picard.

"Yes, captain," said Data, and walked off. Picard, Riker and Troi went back into sickbay.

"Are our guests feeling fine?" Picard asked.

"Yes, we're fine," said Lynn.

"As good it could be under the circumstances," said Hermione.

"I'm fine," said Harry.

"Yeah, yeah, I'm great, but..." said Ron. "...when do you eat on this ship?"

"Ron!" said Hermione.

"What?" said Ron. "It's been hours...er...centuries since I last ate! I'm starving." Picard smiled, and then turned to the doctor.

"Is it safe for them to leave?" he asked.

"Yes, they're in perfect health," Dr. Crusher answered.

"Good, we'll have someone to escort you to your quarters," said Picard, and then tapped his communicator. "Picard to ensign Crusher."

"Ensign Crusher here, sir," answered Wesley Crusher's voice.

"Report to sickbay immediately," said Picard. There was a moments pause.

"Understood, ensign Crusher out," said Wesley.

"You're assigning Wesley to escort them?" said Dr. Crusher.

"I don't see a reason why not," said Picard. "Besides, These youths will probably feel a bit more comfortable with Wesley, being the same age and all." Wesley now entered the room. "Ah, Mr Crusher. These people are our guests. Escort them to their quarters."

"Yes, sir," said Wesley. He then turned to Harry and the others. "If you'd just come with me then..." Lynn got of her bed first, followed by Hermione, Harry and Ron. They then walked out of sickbay, lead by Wesley.

"Quite a strange situation this, wouldn't you agree, number one?" said Picard. Riker chuckled.

"Yes, captain," said Riker.

A/N: That's the introduction, we'll be moving on to more interesting things next chapter, which will be up at the end of the week. It'll also be a lot shorter than this, and I'll try and keep it that way, since: shorter chapter's, more updating!

For those of you that have read my others fics and liked the romance elements, don't worry it'll be a bit of that in this one too (E-BOW, you can continue reading, you won't find it that disturbing as you way think...). You'll probably notice also that this is my first R-rated fic. This isn't so much in terms of romance, but more of drama, some language and violence (I have violence in one of my published fics! Yay!). It's not very detailed on R-moments though, but to be on the safe side I've given it an R.

About my other fics, I'm on a real translators drought on "Not all changes are for the worst...". So don't expect a new chapter of that one until at least two weeks from now. Sorry people... I'll try to get it up sooner than that, but translation is hard work, especially when you got like 50 pages to translate!

Also you should pay ATTENTION to the fact that I now accept unsigned reviews also. It was a bit of a mistake by me, not having fixed that before. Thank you KellyBelly for pointing that out.