Summary: Perseus Jackson somehow went back in time without any memories of his past, er... future. But after joining the crew of a ship with black sails, he has to find his way in this time, while coping with his forgotten memories that are slowly being remembered. On top of that, he also has to keep his heritage a secret.

Disclaimer: I don't own PJO, nor POTC :'(

Prologue: A Sense of Familiarity

Searching for answers

The sea was brought back to life as he opened his eyes, as if the sea goddess Calypso herself was raging. Thunder rumbled in the distance and clouds began to darken. The ship rocked dangerously up and down, dancing upon the enormous waves. Rain was already pouring from the sky and the man, who seemed to be around 18 years of age, could feel his strength coming back to him as a few drops fell on his face.

Not even thinking about the just awoken man, the captain yelled his orders to his crew, hoping they would be able to save the ship from the wrath of the sea. Some began to mutter things as they tried to steady the ship, while shivering from the cold.

The man ran his hand through his raven black hair and stood up, watching the people around him. He frowned, not remembering where he was. No, he could sense where he was. 7 24 71 30. Somehow, he knew what those numbers meant. Coordinates.

Then, he panicked and the sea became even wilder. Water splashed above the deck, making everyone wet. Except him. Not that it mattered to him, since only one question occupied his mind right now. Why don't I remember anything?!

In the back of his mind, he could feel that something was wrong. As if he didn't belong here. He walked toward the railing, ignoring the shouts around him, and looked over the raging sea. It was calling to him. Without him realising it, he was already standing on the railing. A normal person would've fallen off by the ship's movements, but he had already realised he was not a normal person.

He jumped in.

The sea around him calmed the man down. The pulling currents had no effect on him as he swam further down. When he couldn't hold his breath any longer, he realised he could breathe under water. He smirked at that. On instinct, he used the currents to swim even faster than he already did. The man didn't realise where he was going at first. He just followed his instincts.

He knew where he had gone to when he saw the beautiful underwater city in her full glory, after swimming for what seemed like hours. Fish and other underwater creatures swam in and out the city. The city herself was decorated with the finest jewels that could only be found in the deepest oceans and statues of the gods, he realised, were towering over the buildings. In the back of his mind, he searched for her name.

Atlantis.

A weird feeling of recognition went over him, but he shook it off when he saw a dolphin swimming toward him. "Lord, lord? Are you a new lord? I must bring you to my lord." The dolphin swam further into the city and gestured him to follow.

The man frowned at that, but still followed the dolphin. Why would that dolphin call him a lord? Then, another thought occupied his mind. "How can I hear you?"

He would swear he saw the dolphin smirking, but decided that wasn't the case. How in Hades would a dolphin be able to smirk?! Again, he realised a few things. 1) The dolphin already talked, so why wouldn't he be able to smirk? and 2) Why did he just say: 'how in Hades'?

Before he could ask his mental questions, the dolphin answered his earlier question. "Every creature of the sea can hear other creatures of the sea, my lord." The man frowned. So I am a creature of the sea? How is that possible? I'm human, am I not?

Again, before he could ask his mental questions, he was interrupted by something else. This time, it was the arrival at the throne room of Atlantis. How he knew that? Only the Fates would know.

He entered the room, which was really large by the way, and walked toward the three thrones in the end of the room. Only on the middle one was not empty. On it sat a man who was wearing khaki shorts and a Hawaiian shirt - the man raised an eyebrow at that. He radiated power, but that wasn't what amazed the man. His dark hair and sea green eyes, made a sense of familiarity go over him. He knew this man.

After a long time staring at each other, the man finally asked one of his mental questions. "Who are you?"

The god - the man realised - raised an eyebrow at that. "Since you are the one entering my realm, I should be the one asking you."

Another silence followed, before the man couldn't take it anymore and said what was on his mind. Somehow, he knew that he could trust this guy. "I don't know who I am or where I came from... Somehow I lost my memories, but what I do know is that I woke up on a ship. It was like the sea was calling to me, so I jumped of the ship and swam to this place", he explained.

Then, he remembered another thing. "Oh yeah, somehow I knew where the ship was... The coordinates were 7 degrees 24 minutes North and 71 degrees 30 minutes East, or something. And it was storming really hard... Like, almost sinking the ship hard", he added.

The sea god - another thing the man just realised - muttered something about 'not ordering the sea to do that' and narrowed his eyes at the man. "How...", the god started, but nothing more came out of his throat. Then, suddenly he thought of something. "Could you cut yourself?"

"Excuse me?", the man asked. Confusing was written all over his face. How could someone he barely knew - in the back of his mind he knew that wasn't true - ask himself?

"Just do it."

The man frowned, but somehow he knew that he would get more answers if he did what the god told him. He didn't have something to cut himself with, though. He searched his pockets, but the only thing that was in them was a pen with the word Anaklusmos on its side. He frowned at it. Another thing he knew he should know... Uncap it, his mind told him, which he did.

The pen changed into a bronze sword in only a fraction of a second. The blade was leaf-shaped and had a double-edged blade, while the hilt riveted with gold studs. Together, it was about 3 feet long and perfectly balanced. The man looked at the god, whose eyes were widened, before looking back at his sword. It was so frustrating how familiar the sword seemed.

He shook off those thoughts though, when he realised why he had uncapped it in the first place. He held out his left arm and cut it with the sword. Blood appeared on his skin, but it wasn't red. It was golden. But before he could question the color, he realised he felt no pain from the wound. When he looked at it more closely, he saw that the cut was already closed. "How...?"

The man turned to the god. "How is this possible?" He demanded answers.

The god sighed, but still frowned. "That's also a mystery to me, my son."

Waaaaaait a minute... "Son?!"

The god sighed again. "I'll tell you a few things then. Hopefully, you'll remember some things about yourself", the man gestured the god to continue. "I'm Poseidon, god of the seas, oceans, destruction, earthquakes, storms, hurricanes, horses and sea creatures." The god muttered something about 'hating formalities' - the man raised an eyebrow at that - before he continued. "And apparently, you're my son, even though I don't remember siring someone..." The man's jaw almost hit the floor.

Suddenly, his head began to hurt so much, that he grabbed his head with his hands and dropped on his knees. He closed his eyes as he felt the ground under him shift. He tried to concentrate on something else but the pain, but couldn't. When the pain subsided, he remembered three things: 1) The god before him said the truth. 2) His name was Perseus Jackson, but he liked to be called Percy. 3) He didn't belong in this time.

[A/N]: Yeahhhhh new story xD Again... I have too many ideas in my head haha xD... Anyway, this is a crossover, so I don't expect too much feedback on this, but I hope you people will like it :).

Info: Chapters are around 1k-2k, Calypso will be the movie-version (not the PJO-version), some characters may be OOC and some scenes in the beginning are literally from Dead Man's Chest (kinda)...

'Till next time,

Xx Anny