A/N: Hi guys, so this is a crossover between Merlin and Percy Jaackson. I decided to post it here because the story takes place in Merlin's world only. Some characters of the Percy Jackson series will appear, however, it is not necessary to have read the books to understand the plot.

One more thing: I originally wrote this story in German and translated it into English. I checked everything for spelling and grammar mistakes, there might still be some mistakes though, as English is not my native language.

Drenched in sweat, Percy woke up. His whole body trembled. In his dream, he was caught in a whirlwind and tossed about. His stomach felt like he was going to vomit at any moment. Gasping, he looked around . . . and was negatively surprised. He wasn't in his bed in Cabin 3. No snoring Tyson was in the other bed. Instead, he found himself in a small room. The floor, ceiling and walls were built of stone. At the walls, on several shelves, were small vials containing various liquids.

Swaying, he stood up, his head feeling like it had hit something massive. Fortunately, the pain seemed to slowly vanish which gave him the opportunity to wonder where the Hades he was here. He was about to walk towards the door that was across from him when that door suddenly opened. The older man who found his way into the room almost dropped the book he had tucked under his arm in surprise at the sight of Percy.

"Who are you?", The man asked, eyeing him closely.

Percy didn't know what to say. Tell the truth? He didn't even know where he was. How much he wished at that moment to use the mist, as Thalia could. All he'd have to do was snap his finger and come up with some story that didn't even have to make a lot of sense. The mist would help him to be believed. Unfortunately, he had not yet let Chiron teach him that. He'd catch up on that pretty soon once he got out of here. Just in case he woke up somewhere again with no idea how he got there. But now he had to get out of this situation first

"My name is Percy Jackson," he decided to tell the truth. "Could, uh, you maybe tell me where I am?"

The man looked at him frowning, as if Percy had just asked if rain was wet. "Well, you're in Camelot. I am Gaius, the court physician to His Majesty, King Uther Pendragon." Percy's stomach turned again at those words. Camelot? King? Slowly the uneasy feeling crept over him that something was absolutely wrong. He had heard the name Camelot before. But Percy couldn't remember where. He was about to open his mouth to say something, but closed it again when the door opened again.

"Gaius? Is everything all right?" The boy who entered now was Percy's age. Like Percy, he had black hair, only it was less messy than Percy's. His gaze moved from Gaius to Percy. "Who is this boy, Gaius?", he asked.

"I don't know, Merlin," Gaius replied. " He was standing here when I came in. "

Percy's neck hairs stood up. Did this Gaius just call the boy Merlin? Camelot, Merlin. Percy remembered one of the many stories his mother used to tell him before he went to sleep back when he was a young kid. One was about the legendary sorcerer Merlin, who lived in the castle of the equally legendary King Arthur. Now Percy knew the name of the castle again: Camelot. He would have loved to sit down. In the stories Merlin had been an old man with a long white beard. But the guy standing in front of him was neither old nor did he have a long white beard. No, that was not possible. He was certainly not zapped back into the past. In a place that was just so full of magic. It was probably just a bad dream. In a moment he would wake up and see a snoring Tyson lying beside him. Everything would be normal. Maybe he just needed to pinch his arm once. And so he did, a fresh pain shot up into his head. Unfortunately, his surroundings remained the same. He was looking at Gaius and Merli, gazing at each other, when suddenly another voice came from outside.

"Merlin! Merlin, where the hell are you again?" The door was ripped open and a young man with dark blond hair and something that looked like a chain mail to Percy rushed into the room. " There you are! Man, Merlin, I told you to patch up my armour!"

"Arthur, I -" Merlin tried to reply, but Arthur raised his hand.

"Save it! Just come with me now. After all, it's not your job to just stand around and do nothing. Come on!" Then his eyes fell on Percy for the first time. He eyed him for a moment. "Who is that?", He asked. " Gaius, why is he wearing those strange clothes?"

Percy would have loved to have answered: 'Strange clothes? Look at yourself. You walk around in a freaking chain mail shirt!"

But something told him that this would probably not go down well with this guy. And that he shouldn't mess with him. The guy's name was Arthur, so it could be the legendary king from the legend. Though Percy wondered if this was really the legendary king. This guy seemed more like an arrogant prick to him.

Gaius spoke up: "This, uh, is my new apprentice, Prince Arthur. I, um, want to train him to be a skilled healer."

Arthur frowned and looked over at Percy and said, "Maybe he'd be better suited as a juggler. "

Percy did not know one hundred percent what a juggler was, but he was quite sure that Arthur did not mean it as a compliment.

"Hey, Arthur, aren't you gonna go to practice?" Merlin asked him with a slightly annoyed expression.

"Don't be so impatient, Merlin," the prince replied. Merlin rolled his eyes in annoyance. Percy could understand him. It had been Arthur, for whom Merlin couldn't move fast enough a few moments ago.

Arthur looked at Percy, then he left the room, Merlin followed him. So only Gaius and Percy himself were left. The old man smiled kindly at him and said, "Please, sit down."

He pointed to a wooden chair that stood at a table. Reluctantly, Percy sat down. He didn't know if he could trust Gaius. To tell him the truth about himself seemed foolish to Percy. On the other hand, he could see in Gaius' face a similar warm look that his mentor Chiron had. An expression that wanted to tell him: 'You don't need to be afraid. I will try to help you.'

"So", Gaius began. Can you tell me how you got here?"

Percy shrugged, "No, sorry. I just woke up here. I can't remember how I ended up here pr what got me here in the first place."

Gaius looked at him, "Can you remember other things? You said your name was Percy Jackson. Where are you from?"

Percy took a deep breath. That part he could tell about himself. "From the United States. Do you know this place?"

Gaius frowned at him at first, then shook his head, "I'm afraid I'm not familiar with that place."

"Maybe America?", Percy tried.

Gaius shook his head, "Sorry, Percy. You truly must have come a long way." The court physician examined him thoroughly, Percy, on the other hand, sat uneasily in his chair. " Are you all right, Percy?", Gaius asked.

Percy nodded, "I'm just have trouble sitting still. "

Gaius looked at him with a calm look: "Interesting." He took a look at one of the shelves on the wall. "Percy, would you be so kind and tell me what's on the back of the book?" Percy felt the blood in his head start boiling. Why did Gaius ask that of all things? A very bad feeling came over him. "You can't tell me. Am I right?" asked Gaius and sounded sympathetic.

"I – . . . no, I can't. The letters . . . they always blur. " At the same moment, he would have liked to bite his tongue. Why was he so reckless? Percy would have liked to slap himself in the face, which probably just looked pretty stupid.

The next words Gaius spoke with absolute calmness in his voice. "You're a demigod. Right, Percy?"

Percy felt like someone had punched him right in the face. How did that Gaius guy see through him after only a few minutes?

"I – um", he stammered.

Gaius put his hand on his arm. "Don't be afraid. I won't tell anyone."

Percy wanted to deny everything, say he wasn't a demigod and didn't even know what it was. But he doubted that Gaius would believe him. Instead, he nodded weakly.

The man had instead sat down opposite him. "There's one thing I don't understand. What is a demigod doing here on Camelot? The gods are not longer worshipped as they once were. Only a few are still familiar with their names. When I think of how much magic spread before King Uther . . .", he fell silent.

Percy wondered what Gaius meant. What had this king done? He wasn't sure, but he believed that not everyone was enthusiastic about people with magic. A worried expression appeaared on Gaius's face: "Now I must protect two people and keep their secret."

Percy looked at him questioningly. Two people?

Gaius sighed, "You must know, Percy. King Uther ordered all magic to be banished from his kingdom several years ago. If anyone is found guilty of sorcery, the king will have him executed immediately." Percy's jaw dropped. " W-Why is that?"

Gaius sighed, "It's a long story. " Then he stood up, "Come, Percy. I'm afraid I'll have to introduce you to the king."

Hearing these words, Percy winced, "W-Wait, really?"

"It has to be, Percy," Gaius replied. "The king must allow you to stay in the castle."

Percy didn't like the idea at all. After everything he had heard about Uther Pendragon, he was not particularly keen to face him. But he seemed not to have no choice.

"But before we do that", said Gaius, "you should change. In that outfit, you're just arousing suspicion. I think I can find something suitable for you."

About half an hour later, Percy had changed his clothes. He had exchanged his pajamas for a simple shirt, trousers and a pair of leather shoes. Gaius looked satisfied. "With this noone will notice you're not from here", he said. "I'll take you to the king now." He turned to Percy again: "Oh yes, when we get there, try to act naturally. You want to become a healer and therefore you're going to be my apprentice, all right?"

Percy nodded. He didn't know much about medicine, but if it would work as a disguise for him, he was fine with it. It would also probably mean that he would be with Gaius most of the time and that thought calmed him a little. They walked through the castle. The floor was built of smooth stone, on the walls Percy recognized a few knight's armors here and there. Every now and then other people would pass them by. Most were probably servants of the castle, but sometimes people in chainmail slipped through the corridors. They had almost arrived at the throne room, at least according to Gaius, when a young woman approached him. She wore an elegant dress, her black hair was braided into a braid. When she saw Gaius, she smiled.

The court physician bowed, "Lady Morgana. "

Gaius quickly looked over to Percy. He understood and bowed as well.

Morgana smiled at Gaius, then turned to Percy. "And who are you?" she asked with a smile.

"I'm, um, Percy", he said.

Morgana looked at him with a certain amount of curiosity: "You're not from here, is that possible?"

To Percy's relief, Gaius spoke: "Percy comes from a village a little further away. He lost his parents and came to Camelot to start a new life. "

Morgana looked at Percy sympathetically: "I'm sorry to hear that."

"It . . is all right", said Percy.

"It's been a while. I've learned to get through somehow." Morgana nodded with an understanding expression, "Where are you going?"

"I wanted to take Percy to the King and ask him if he could stay in the castle." When the king was mentioned, Percy thought for a split second that there was a shadow over Morgana's face. But as soon as it came, so quickly it was gone.

Morgana smiled brightyly: "Then I wish you good luck. "

She went on, Percy and Gaius went in the opposite direction, and soon they were in front of a heavy wooden door. The entrance to the throne room, as Percy suspected.

"Are you ready?" asked Gaius.

Percy didn't feel ready. He didn't want to meet the man who might be the one to proclaim his death sentence.

But instead, he just nodded, "I'm ready."

And then Gaius opened the doors to the throne room.


Small water droplets fell from the ceiling of the cave. The rock on the walls was also damp. It was not the most pleasant place, but it was remote and well hidden. No one would be caught dead here so quickly. Luke Castellan knelt before a golden sarcophagus positioned on a huge altar. In its sides were carved scenes of cruel battles. An aura of unimaginable power emanated from the sarcophagus.

"So? What do you have to tell me?", a voice echoed, which seemed to come from the sarcophagus. The voice of Kronos, the titan lord of time.

"Everything has come to pass as you foresaw it, my lord," Luke replied. "Percy Jackson has arrived on Camelot. This concludes the first phase of our plan."

"And the witch?", Kronos asked.

"I'm going to see her in a moment. I'm sure she'll help us with our cause. Our negotiating position is favourable. With our combined strength, Camelot will fall."

"I don't care about the castle!" the voice of Kronos thundered. "I only desire one thing."

Luke flinched at the force of Kronos" words. "Of course, my Lord. Your resurrection."

"You know, son of Hermes, if this plan fails, there is only one other way."

When the titan mentioned his father, Luke frowned with anger. "The plan will not fail", he said in a firm voice. "I'll make sure of that. You will be able to rise again and take vengeance on the gods."

"Then get to work, Luke", Kronos ordered him. "Find the witch. She's very powerful. Her magic can bring bring me back at last."

""As you wish, my lord. "