Atlantis BBC TV series and Percy Jackson crossover

I don't own anything. (Except the plot.)

This story will be canon and post-Blood of Olympus but there will be some alterations to the canon, such as the meeting with Heracles never existed.

In this story I'm going to say that when Jason arrived in Atlantis he spoke Ancient Greek fluently as if it was English. This also works because Percy can speak Ancient Greek anyway.

Prologue - Percy

Percy woke, wearing nothing except a necklace around his neck which had 5 clay beads attached. Next to him was a pen. He was lying on a sandy beach, the round granules of sand cushioning him. The gentle lapping of the sea behind him with fishermen in the distance. A brilliant blue reflected from the sky where the bright sun radiated down upon the land and sea. In front of him was the rest of the sandy, yellow beach and beyond, over the sand dunes, was an ancient city built into the mountains ahead of him. The buildings were mostly simple and low-lying, made of mud bricks. However, there were a few buildings that were spectacular in size and glinted in the sunlight as if there were jewels surrounding them. The city was fully surrounded by a wall and protected by the mountains.

Percy's first thought was to find some clothes. Luckily, around 10 feet away, was an abandoned boat with what looked like clothes in. As Percy approached he realised, although they were basically rags, that they were very similar to the clothes he'd seen some of the minor gods and goddesses wear on Mount Olympus when he had visited. Something like "fight-on", though that couldn't be right.

'Chiton' he muttered, yes that was it. He could almost hear Annabeth talking in his head giving a full definition. Not that he needed that.
First of all he needed to find out where he was and what was going on; his last memory was going to bed after a sing-along around the campfire.
''If Hera's messing with me again…' he grumbled under his breath.
After pulling the "chiton", or "rags" as he would be calling them, over his head he set off towards the city.

This was obviously no modern city and although Percy was no genius, he realised pretty quickly that either the gods were messing with him or something had gone seriously wrong.
After the giant war 2 months ago, the last thing he needed was another adventure promising nothing but pain and life threatening experiences.

He approached the gates of the city where there was the hustle and bustle of everyday life in and out of the city, only that it was obviously nothing from the 21st century.
Percy had definitely seen stranger things in his lifetime but what him most worried was how he felt a connection with the city. He gripped tighter on to his pen that he knew if uncapped would turn into a bronze sword - riptide, or anaklusmos in Ancient Greek.
As he entered the city he saw street vendors selling fruits such as watermelons, wealthy merchants who looked middle eastern and other traders getting on with their daily lives.
However, he was shocked when he saw a sleeping giant snake. And when he said giant, he meant giant - the thing had to be 50 feet long with a trunk-like body curled into a huge woven basket. People wondered around it which Percy assumed was because of the usual tricks of the mist.
Something unsettled him though, if he really was where he thought he was, at least where in time he thought he was, then surely the mist shouldn't exist.

As he neared it, the snake lazily opened an eye but when seeing Percy, flicked it's forked tongue as if smelling the air which it probably was (Percy was used to monsters taking a good sniff of him, he'd heard he smelled like buttered bread though Percy didn't know whether he'd even like that smell, maybe monsters like buttered bread). He knew the snake must've smelled demigod because it was alert instantly and struck at Percy.

Percy wasn't there though, years of battle training (and fighting battles) took over as he rolled to the side whilst instinctively uncapping his pen and cleaving his leaf-shaped sword through the monster's body.

However, unlike normal monsters, it didn't disintegrate into dust, it just lay there dead, obviously, in two pieces - a head, and a body.

He heard shouting which he understood with no problem but there was something foreign about the language. He soon realised it was Ancient Greek - no wonder he'd thought it sounded so familiar. This only confirmed his suspicions, that he'd been sent back in time one way or another to Ancient Greece.
And by the looks of it had just chopped up someone's pet snake.

'Oops' he muttered under his breath as guards surrounded him. Luckily, or unluckily, he'd already capped riptide, so at least there was no evidence - unless the guards thought he was really good at karate or something (though Percy was pretty sure the was no karate in Ancient Greece).
Percy probably could've fought through the fifteen or something guards that surrounded him but he realised he must've been sent here for a reason, well or for a joke but he didn't ponder on that thought.
He already hadn't made the best of impressions and he decided it would probably be better to go quietly to face whatever punishment he had to.

He raised his hands and two of the guards came forward and roughly took his arms and dragged him to wherever they took hardened criminals (sarcasm).
Percy didn't like being forced to do things, he could blame his father for that, 'the sea doesn't like being tamed' and all that.
So he didn't like it when he was forced to his knees and looked upon like some mere peasant in front of the head of the guards, until he remembered the heirarchy system in Ancient Greece, as well as that he did look like a really dirty peasant.

Apparently one of the guards had a great idea as a punishment because they were all having a right good laugh at it. Percy picked up something along the lines of 'enter him in the tournament' and 'put him against Heptarian.' It sounded like they wanted to humiliate him but if they really were putting him in some fighting competition, he'd only be to happy to oblige.

The head of the guards approved of this 'punishment' but would have to see the king about it. Why they needed to have the approval of the king, Percy had no idea, maybe he'd become the court jester.

The head of the guards came back in and grunted something like 'come with me' though Percy couldn't be sure because of the familiarity of what the guard just said and the sound that a pig makes. Nevertheless, Percy followed him.

Percy was really getting annoyed with this whole 'arresting' business. First marched across the market square to guards central, now marched back across the market square (so humiliating) to the palace. (Okay so he actually was going to where the took hardened criminals…)
It really seemed like too much just for chopping up a snake, okay maybe that was pretty mean but the snake started it!

Finally, he was shoved down on his knees in front of the king. He really didn't feel like displaying respect to a king of all things. After all, he'd faced far more scary things (Tartarus (capital case and lower case), Gaea, Kronos, etc.) but he figured those guards wouldn't hesitate swinging their fancy bronze swords, that looked wicked sharp, at his neck.

Percy was almost relieved when the King spoke, he'd been waiting for his punishment (just get it over and done with already) for ages and it really didn't help being ADHD. However, when the King spoke Percy almost burst out laughing.
'It is Poseidon you have wronged ('yeah if only you knew buddy'), and as such you will be put in the tournament to honour the nuptials, there the gods will decide your fate'.
Percy had no idea what the nuptials were,why he'd wronged Poseidon or how the gods would decide his fate (though that part seemed to be guaranteed in his life) but he decided to go with it.

He was then dragged out to the prison cells which were to be his home for the night. He'd tried to get as much information out of his guard as he could, that was until he got kicked in the stomach and was told to shut up.

He learned that he was in Atlantis, which apparently wasn't underwater (yet at least), and it was a city sacred to Poseidon and therefore any crime done in the city was a crime against Poseidon. Percy figured he could either get a godlike status as the son of Poseidon or he'd just get executed for pretending (he guessed the latter.)

Pondering over these thoughts, Percy rested his head to try and get some sleep for whatever laid ahead of him for tomorrow.

What seemed like only a few seconds later Percy was roughly shaken awake by a guard (these guys needed to learn some manners). In a daze, Percy stood and followed the guard. Not only had he had a dreamless night (he couldn't remember the last one of those he'd had) but he also wasn't used to being shouted at by a guard in the morning and those clanging and crashing noises of the metal doors really didn't help his growing headache.

After a few minutes of following the guard they came to a room which lead out into an arena which was open roofed. There was a full crowd which had just quietened down.
'We are here today to celebrate the betrothal of Poseidon's servant (Percy scoffed at that), Heptarian (queue cheers of the crowd)'. A man who looked in his mid-twenties came forward in the arena and raised his hand. He looked, well, Greek. He had a neatly trimmed beard, dark, oiled, combed back hair and a calculating look in his piercing eyes. 'And our daughter, Ariadne' (queue more crowd cheering). At this he gestured to a grumpy looking, beautiful tanned young woman (who also looked very Greek in Percy's opinion) who had long, wavy, dark hair and dark brown eyes.

Percy remembered hearing about marriages where the woman had no say in who she married and guessed this was such a case. The King continued:
'This tournament, if Heptarian succumbs as the winner' he said this with a glint in his eye as if there was no way that would not be the case, 'and might I say how he is undefeated',
'Well that explains it' Percy grumbled under his breath
'Will prove his worthiness to be the suitor of my daughter, Ariadne.' He paused for dramatic effect - which was really unecessary in Percy's opinion.

'Now' he said in a booming voice
'Let the tournament begin!'