I've been wanting to do another one of these for long time considering we are now dealing with multiverses. Please enjoy! :D

Btw Flash Flood and Shadows never happened. At all. So please bear with me.

And also Percy is still a teenager in this story; erm...I really do not know. What do you guys think? I do not tell his age or say how old he looks so I can fit in age later. What do you think is a good teenage age? Eighteen? Seventeen?

This takes place after episode 9 (so it might be a while before I add more chapters as new characters will appear). And after Blood Of Olympus in the Percy Jackson world.

Disclaimer: I do not own any of the characters expect my OC's. Flash characters belong to DC Comics and CW. Percy Jackson characters belong to Rick Riodan.

It was a quiet night in Central City. In fact the quietest it had been in a long time. And by quiet (by at least the population's standards) was no crime or new Metahumans.

Well...almost.

An abandoned building sat menacingly in the shadows near the outskirts of the city. Its windows were shattered and the wall had a gaping ten foot high crack that that snaked its way up the building like a earthquake fault. The wind occasionally whistled through the two foot wide space and made a shrieking noise as it entered the building making feel colder than it really was.

Overall it was somewhere that even someone really brave did not want to be at night.

Inside the building lay a couple of metal bars that were twisted into impossible shapes. They were the supporting bars for the roof until neglect and a giant worm hole had pummeled them. The roof sagged and here and there were holes that allowed some of the pale moonlight to pour through.

All was quiet in the building except for the occasional cricket. Then a rustling noise started up followed by a squeak. The pile of dirt by the debris pile skittered forward as a nose poked out of the hole formed by one of the metal bars. It quivered slightly and was soon followed by two bright eyes and long whippy tail. The rat scurried forward sniffing the air cautiously. Its tail twitched nervously.

The air had a scent that screamed that something was about to happen. And in a city that had weird events occur almost everyday that was not a comforting thought. But the rat did not know that. All it knew from within its brain was that there was something dangerous in the air and that it better finish is scavenging quickly.

The rat took another hesitant step forward when there a loud shriek. It sounded as if the air itself was splitting in two.

A glowing, swirling blue vortex appeared hovering a couple of feet off the buildings floor. Its glow illuminated the entire room. Squeaking in alarm the rat fled back to its hiding place and dove for cover as the wormhole started pulsing. It glowed suddenly brighter than usual and something tumbled out of it. Two things actually. One of the items was a backpack. The other was alive.

With a loud pop the wormhole disappeared sending pieces of an unknown element everywhere in a mist of fine silvery dust. For a moment whatever living had come out of it did not move from its crouched position on the ground. The rat watched not knowing who this was that had tumbled into its world. It cautiously stepped forward once more and sniffed.

Whatever the 'something' it smelled of human. And a very upset human to. The rat could smell the waves of anger pouring off the still body as the person lay there breathing heavily as if they had run miles. Then they started to move. The rat backed up into its hiding place and watched as the person got to their feet. They looked around and cursed quietly under their breath. A familiar shriek resounded across the building making the person jump and stumble back as the vortex appeared again. It glowed and a sword tumbled out of it hitting the ground and skittering forward with a spray of sparks. As if it were pleased with delivering the weapon to this earth the wormhole glowed slightly before it disappeared again but silently this time.

The person stared at the sword cautiously. It was glowing faintly; illuminating little of the factory with a pale bronze light. The rat watched and with it limited knowledge and intelligence could not comprehend as to why the person would not pick it up. It knew enough of what the humans used to eradicate its species. Poison, brooms, traps to name a few. This glowing stick no doubt was used to kill other things besides rats; perhaps the human's own kind.

With a sigh the person bent down and snatched the sword up. They turned it this way and that looking for any damage it had. Satisfied that it was undamaged the person bent down to pick up the backpack. They swung it onto their back before they walked over to the crack in the wall. The crack that led to the outside world. The rat followed; curious at to whoever this was.

The person moved with a silent gait and moved as cautiously as they could. When their foot struck an old soda can they froze and whipped their head around as if afraid that something had heard it. But nothing heard it except for the rat. It took a long time for the person to start moving again.

Reaching the crack the person hesitated. They looked around. Their features were obscured by the shadows the building had cast on them but anyone could tell this individual was tall and skinny. And no doubt very young.

Breathing heavily the person stepped through the hole. He picked his way through the rubble that poured of the improvised entrance of the building and glanced up at the stars above them. The rat followed them out once more and stopped behind the person. The person muttered something incoherent under their breath before touching the tip of his sword. It shrank down into a small skinny object that they placed into their pocket.

Its curiosity sated the rat crept back into it home as the person started into the long grass, heading towards the city. Every twig they stepped on made them freeze and place their hand near the pocket that held the object that was once a sword. But once they reached the entrance of the city the person seemed to relax a bit more as if they were in familiar territory.

They kept to the shadows making sure not to let any of the occasional pedestrians to notice them. The person heaved themselves over walls and continued to walk through the back alleyways occasionally glancing over their back. Only once did they hide behind a trash can when a police drove by.

The person narrowed their eyes as the police car drove past without detecting them. The night was silent except for the person's light breathing.

"Hiding from the cops are ya?"

The person whirled around hand reaching for pocket as they retreated into the darker shadows. But they froze noticing the speaker was an elderly homeless man. A small street light hung above him lighting everything with an orange colored light.

"No...I'm just not sure how they would take someone of my age creeping around an ally way this late," the person replied.

Their voice was masculine and had a hint of suspicion and caution hidden within each syllable of their words.

The old man chuckled, "They are not the ones to worry about kid. Its the one who works with them you have to worry about."

The teenager knitted his eyebrows before stepping forward slightly into the light. He had jet black hair and his eyes were sea green. But they had a sense of urgency hidden with them along with worry.

"Who? Who do I have to worry about?" the man asked.

The old man gave him a smile that showed he was missing a tooth, "Where have you been all this time? He is quite well known."

"A little busy..." the kid admitted.

"Well then," the old man snorted, "I guess I can have much fun with this."

"Please just tell me..." the teen asked, "And stop speaking in riddles. I hate them."

"Fine...don't need to be testy about it," the older man huffed before continuing in a smooth tone," The crooks in these parts are scared to death of him."

"Why?"

"Why? Why!?" the old man chortled, "They are scared to death of him because you can't see him coming. And in many cases you can't hear him coming. You could be holding a gun to a woman's head one second and the next you are handcuffed to a light post before you even know what hit you."

The teenager frowned at the old man's description, "What else can you tell me?"

"Not much," the old man admitted, "There is not much known about him except for his name."

"What is his name?"

Here the old man sighed, "He has been called a great deal of names. The 'Red Blur', the 'Streak', Central City's Guardian Angel, or if you prefer 'Scarlet Speedster'. But now he is well called by the name the 'Flash'."

The teen frowned as the older man kept talking. His words blurred into the background replaced by one's that resounded in the younger man's head as well as images.

"If you ever want to see her alive again...you must kill someone for me." hissed a creature.

His face looked half melted and his eyes were a solid black color. It was the face of death.

"Are you crazy? I will never kill anyone unless...well...they are a monster. Like you," the teen retorted pulling his sword out, "Now give her back!"

The creature chuckled menacingly, "You know your sword cannot harm me boy! So if I were you I'd put it away before I run it through your body."

The teenager trembled with rage but managed to lower his sword to his side.

"Good boy..." the creature purred, "Now go ask your precious father how to get to the one I seek."

"And what if I don't and I ask him to kill you?" the teen asked threateningly.

The creature threw his head back and laughed before turning to the young man and hissed, "Well...I guess your girlfriend finds out what its like to have her heart vibrated out of her chest."

The teenager threw his sword at the creature's head. Before he could blink the creature had grabbed it out of midair and had it pressed up against his throat. The teen choked as his blade pressed into his windpipe.

"That was...unwise," the creature growled lifting the boy effortlessly into the air.

The young man flinched as the monster pressed his face up to his. His face was even scarier close up. His eyes radiated hatred and blue electricity sparked around his body. Much of it dissipated but some stung the teenager in in the face causing blisters to arise. His voice smelled sour as if he had gargled with acid. If he had it explained why his voice sounded like an even more deranged Dark Vader's.

"You will go to this other earth and kill my hated enemy," the creature snarled as he pressed the blade deeper into the young man's neck, "Only then can you get your girlfriend back."

"What if I refuse?" the teen challenged and he swallowed hard as he continued to look down at the cold blade pressed to his neck.

"You amuse me..." the creature chuckled, "Your bravery is commendable. But it will not help you now. Kill him or better yet maim him for life and I will promise you what you want or she will not be the only to die. I think you know who I intend to kill if you refuse."

The boy managed to look into the creature's eyes and nodded grimly.

The creature grinned a ghastly grin. He released the sword and dropped the teenager unceremoniously to the ground. The young man gasped for air and managed to stagger to his feet. He gently touched his neck where a line of bright blood had appeared. Shakily he wiped it off and looked at it as if he could not believe he was bleeding.

"It appears we have an understanding," the creature hissed, "Now go to your father and ask him how you can get to my enemy's earth."

"Earth?" the teenager questioned before sarcastically asking, "Oh now you are telling me there are other earths Death Face. Hate to break it to you but there are not any more earth's than the one I am standing on."

"Oh but that is where you are wrong," the creature said completing ignoring the insult the young man had thrown at him, "There are multiple earths scattered across time and space. Some of them have a person that looks like you but are different in many ways. One earth you may be a doctor's son or on another a wanted criminal. On the particular earth I want you to go to there is no one there like you which should make it easy for you to blend in as long as you are not caught by doing something stupid."

He spoke the last five words with contempt.

"Ok...so let me get this straight," the teen said, "You want me to travel to another 'Earth' and kill someone in order to get my girlfriend back? Congratulations you are even crazier than Ares."

The creature hissed in distaste, "Watch your tongue boy or I will cut it out."

The young man smirked at him but inwardly he was shaking with fear, "So who do I have to look for? What is his name?"

He had no intention of killing the man this creature wanted him to kill. But what was he to do?

"He is called the Flash."

"Kid? Kid? KID!?"

The teenager blinked as the old man's shouting brought him out of his daze.

"Sorry...just blanked out for a second..." he muttered.

"As I was saying..." the old man continued, "Be careful if you intend hanging out here tonight. There is another teenager here that has a bad habit of trying to steal anything off anyone who walks here. He's quick with a knife and will not hesitate to slit your throat if he gets the chance."

"And why does he not bother you?" the young man asked.

He was concerned about the elderly man's wellbeing if such a dangerous individual was roaming about.

"Because I usually do not have anything worth stealing," the old man grinned, "Now run along but be careful."

The teen nodded and muttered 'thank you' before hurrying off down the ally. He hadn't gotten more than thirty feet before another voice startled him.

"What's in the bag?"

The teenager whirled around to see another boy about eighteen. He had dark eyes and shaggy brown hair. As the teen watched the boy flickered out a switchblade. The blade of the knife glinted faintly in the dim light.

"I asked you...what's in the bag?" the boy snapped.

He drew a little bit closer to the teenager and stopped several feet away from him.

"Nothing...clothing," the teen responded.

He decided not to mention it also held a wallet with two hundred dollars in cash, a photograph, and a canteen full of liquid. The teen reached for his pocket before dropping his hand to his side. He had enough with experience with people attacking him to that his sword would not hurt some. And unfortunately this individual was one of them.

The other boy chuckled, "You are a liar."

Then he lunged slashing with his switchblade. The teenager dodged most of the strikes but had the knife cut deep into his right arm when he was too slow to avoid one slash. He let out a yelp and cradled his arm as blood gushed forth. A couple of drops fell to the ground. He managed to give a glancing blow with his fist to the other boy causing him to stagger. The teenager turned to flee. He fled down the ally way hoping to come across a street that he could dash across and get help.

But unfortunately the other boy recovered quickly and was soon after him. The teenager ran down the alleyway his shoes thudding as they hit the ground. When he ran through puddles the water shot up but did not splatter on his body. It was as if the water couldn't touch him. If the boy following him saw this he did not find it strange.

The young turned a corner and reached a dead end. He cursed and turned around but found his pursuer had cornered him.

"Now give me the damn bag!" the boy snarled.

He lunged for the backpack but the teenager backed into the wall his face red with rage. Behind him was a water pipe. As he drew closer to it, it started to rumble and shake.

"Stay back...I-I-I don't want to hurt you," the young man said barely keeping his anger in check.

He dashed his left hand against the wall in an effort to see how much farther back he could go; unknowingly leaving a bloody handprint behind.

"Too late for that," the boy growled.

He lunged again with the knife when the water pipe exploded. Gallons of water shot forth and slammed the boy into the ground in a makeshift flash flood. The boy sputtered and thrashed as the water swirled around him. The young man was red in the face with rage and he had both his hands stretched out in front of him. The boy started going blue in the face and his thrashing intensified. He was drowning. The water turned red and the teenager was not sure if it were from the wound he had received from the switchblade.

"Stop."

Was it his consciousness that was speaking? Or was it his father?

"Stop Perseus. Is this what Annabeth would have wanted?"

The rage drained out of Percy's face and he dropped his hands to his sides. He staggered back panting as the water dispersed showing the still body of the boy. A jagged piece of rusted pipe jutted out of his chest; shrapnel from when the pipe exploded. Blood soaked his shirt with a crimson color.

The worst part was seeing the boy's eyes. They were wide with terror. As the teenager watched they glazed over.

"I killed him..." Percy realized with horror as he continued to back away from the body, "I killed him."

He wasn't sure how. Was it the pipe piece or had he drowned him with the water by causing it to fill up his throat?

The young man turned and fled trying to get away from the atrocity he had created. He had done something he had never done before. He had killed someone. More specifically a mortal which went against the code he was supposed to uphold.

Now he could only hope that whoever the old man had described was not going to be on his tail.

So um...how did I do?

Heads up. Some chapters might be this long others might be shorter. Depends on how it turns out.

Please R&R!