I just suddenly got this idea when I was watching Justice League, this is my first crossover, so please go easy on me, I hope you enjoy.

PLEASE NOTE: This crossover is based on the TV show and the first series of Justice League.

This story is set after the giant war and just after the episode: 'Comfort and Joy' in season two of Justice League.

The white martians from the first episode of JL returns, and have now teamed up with Greek monsters. They threaten to tear down Gotham City, Central City and Metropolis and then the whole world because JL killed their leader.

Pairings: Percy/Annabeth, Jason/Piper, Hazel/Frank, Hawkgirl (Shayera Hol)/Green Lantern(John Stewart).

For the sake of this story, Thalia is no longer with the hunters, but there will be no Thalia/Nico pairing.

1. Strange encounters

Superman and John Jones had just left Smallville, and were flying towards Metropolis.

"So, did you enjoy spending Christmas with us?" asked Superman over the wind.

John gave him a small smile.

"Yes, thank you Superman, I haven't celebrated Christmas like that for a long time." he replied.

The peaceful moment was suddenly broken when a girl's shrill yell filled the air. Superman and John had skidded to a stop and listened for the source of the voice, though it sounded more of a battle cry then a yell for help.

"You're right Jason, these horses are much easier to fly with then those Pegasus back at camp."

"Well I hope you like him; it took me ages to tame the one you're on."

"Yeah…but don't try to change the subject, I'm still going to make you pay for your prank."

The last line was followed by a clashing of metals as Superman and John hurriedly flew towards the voices; what Superman saw next was nothing he'd expected to see. A girl with spiky black hair with a streak dyed blue, wearing a leather jacket and ripped jeans sat on a horse made of nothing but storm clouds, with a spear with a sharp bronze tip on it.

A few metres directly in front of her were a boy with blond hair and had matching electricity blue eyes as the girl's, and he too, had a spear in his hand but with a golden tip. They both looked around 16 years of age and seemed to have some sort of godly aura around them. The girl charged forwards on the horse and dueled the boy who looked nervous.

"Stop!" commanded Superman, but none of them paid him any attention.

"Stop this right now!" he yelled yet again, he tried to approach them, but he was instantly zapped with lightning when he was only a few metres from the dueling pair.

"Superman!" yelled John as he flew to Superman who was falling out of the sky.

"Thanks." muttered the man of steel shakily as he flew back up to the pair who were still dueling.

John tried to read their minds to get them to stop, but it was as if there was a barrier around the teens' mind, and he could not get through it. Suddenly, the boy flicked his spear and it changed into a sword, he hit the girl's spear with a loud Clang! And the spear flew out of the girl's hand. She reached out to grab it, but lost her balance and slipped, falling towards the ground going at 100 k/h. But the boy didn't seem to go down after her. Superman immediately dashed down towards the girl while John turned to glare at the teen still on the cloud-made horse and looked calm.

"Why did you do that? If Superman doesn't catch her in time, she could die." said John.

The boy smirked.

"She'll be fine."

But his expression formed into a confused one.

"Superman?" he asked, looking up at the Martian in front of him.

His eyes widened as he looked at John for the first time.

"Wha…you…what? How are you…who are you?" he stuttered, pointing the golden sword at John threateningly.

John frowned at this, does this boy know about the Justice League? How does he not know who he is? But before John could reply, the girl's shrill yell filled the air once again.

"JASON! I'M GOING TO KILL YOU!"

John looked down, expected to see Superman with the girl in his arms that he saved, but he was a few metres behind the girl who was flying up by herself to where John and the boy, Jason was.

"Oh Pluto." mumbled the boy, looking a little scared as he positioned his sword.

"Y'know, Thals, I'm beginning to think that it was a terrible idea to teach you how to fly." he stated.

The girl snorted.

Jason seemed to suddenly remember that he was not alone with the girl. "Uh…Thalia? Um…turn around." he said slowly, glancing nervously at John and Superman hovering behind the girl.

She frowned and did as she was told, and flew backwards a few metres. "What the Hades!" she exclaimed, staring at the Martian and the man of steel in shock.

"We need to go talk to Chiron." said Thalia.

"Agreed." replied Jason.

"Chiron?" asked Superman.

"Something's not right." said Jason, ignoring the confused Superman and John. It was only when the girl had settled on to her cloud-made horse, had Superman realised they were leaving.

"Wait, who are you?" he asked.

"Sorry, no time. I think your friend there knows anyways." replied Thalia bluntly before grabbing Jason's arm.

"Wait, where are y-" but Superman was cut short when a strike of lightning shot down from the sky and zapped the pair, but by the time Superman and John recovered from their shock, the boy and girl was already gone, leaving nothing but the smell of ozone in the atmosphere.


Diana, princess of Themyscira was simply enjoying a cup of coffee in the town plaza of Metropolis. She did the occasional wave and smile when a pedestrian waved at her, or took a picture. She was about to take another sip of her coffee, when she felt a tug on her trouser leg.

"Wonder Woman, can you take a picture with me?" asked a 5-year-old girl shyly.

Diana smiled and nodded.

After the girl ran back towards her mother with the camera with a smile on her face, Diana couldn't help but smile at the scene, though it still painfully reminded her of her own mother that was on Themyscira. She gazed around her; pedestrians laughed and talked about, couples sat contently around the fountain in the middle of the plaza that created beautiful rainbows. Everything was fine, no lives in danger, and no crazed robots trying to take over humanity. Diana was about to return to her coffee, when she saw something that made her look at the fountain again. A boy around the age of 16 with a muscular body but a babyish face sat facing the fountain. But what stood him out was that he was talking to the fountain. Diana frowned slightly, though she couldn't see his left side so he may've just been on the phone. Diana squinted and she finally noticed what put her off. There was a face in the rainbow, literally, a face of a young and pretty girl with coffee-coloured skin and curly brown hair; and she was talking back to the boy. They were talking like nothing's wrong, and the people around the boy and the girl in the fountain didn't even seem to notice it. Diana turned back to grab her mug, before turning around towards the spot where the boy was, but he was gone, instead, a small bird sat in the place where he was and flew off, the girl in the fountain was gone. Was she just seeing things? Surely not. It couldn't be. Was it all just her imagination? Diana decided that she would have to talk to John about it, but for now, she still had a cup of coffee to finish.


"Now that is how you celebrate Christmas." said Hawkgirl as GL lowered them slowly towards Earth's atmosphere.

"Did you really have to land us in the middle of the Atlantic?" asked the Thanagarian.

"Well, my ring's about to go out, I used most of it up when during the fight." said GL.

"Well, can you at least scan where we are or how to get back to your apartment so you can recharge?" asked Hawkgirl.

GL nodded and did a quick scan with his ring.

"We're exactly 1027km East from Metropolis." he said.

"Race you?" challenged Hawkgirl.

Green Lantern smirked and shot off.

"Hey! You cheated!" scolded Hawkgirl as she shot through the air to catch up to GL who was still smirking.

Not long after, they spotted a beach up ahead. They slowed down their flight; well mostly GL did anyways because his ring was now flashing, when they were only about 1km from the beach, they heard laughter from below them. They frowned at each other and looked down; a boy around 17 years of age with a mop of jet-black hair and sea-green eyes chased a girl with honey-blond hair and startling grey eyes through the water. This would've been fine, if they weren't a kilometre out at sea. From the corner of her eyes, Hawkgirl saw something large and dark move in the water and were headed towards the teens that didn't seem to have a care in the world. Suddenly, the dark-shape surfaced, and out popped a large shark, the biggest shark on Earth Hawkgirl and Green Lantern had ever seen. Its teeth were razor-sharp and its beady black eyes were staring straight at the two teenagers who didn't even notice the huge shark.

"Watch out!" yelled Hawkgirl as GL swooped down and created a bubble around the two and lifted them out of the water.

"What the Hades?" said the girl, surprise written all over her face.

"Who are you?" asked the boy, in a calm yet threatening voice as he placed his hand on his pocket. When the two finally saw Green Lantern and Hawkgirl for the first time, they jumped back in shock.

"What the-"

But the girl covered his mouth quickly and whispered something in his ear that Hawkgirl and GL didn't catch. The boy's eyes widened immediately.

"Let us out, now." commanded the girl.

"Not until you've reached the beach, you two shouldn't be out here swimming out here by yourselves, you were almost eaten by a shark for god's sake!" said GL.

The boy frowned and looked underneath him.

"Oh…you mean Leroy? He's just a friend, I told him to come." said the boy as he stared at the shark that was now circling below them.

That was when GL realised…they weren't wet. But they were just swimming moments ago, how did they dry themselves so quickly?

Suddenly, the girl took out a knife from her shorts belt and stabbed at the bubble, it burst immediately when it collided with the metal and the two of them dropped towards the sea.

"Hey!" yelled GL, diving in after them.

But when Hawkgirl and GL went beneath the waves, the two teens were already gone.

"Who were they? And what did the boy mean by 'friend' about that shark?" asked Hawkgirl as they two of them surfaced.

GL shrugged.

"Probably just imagination or something."

"Should we take tell this to the League?" she asked.

"Well, that girl just used a simple knife and she manages to burst the bubble, I have no idea how she did it but if a girl has a knife that can easily break a Green Lantern's creation from the power ring, I think it's worth talking about."


Wally West was strolling down the streets of Central City, trying to decide which restaurant to go to, when an explosion shook the streets. He turned around and saw that the entrance to the Central City bank was now on fire and he saw a flash of red, followed by a gruff laugh. Wally speed-walked as slow as possible (which was still quite fast) towards an empty alley and quickly changed into his costume. He sped fast surprised-looking pedestrians and arrived at the crime scene. Bizarro and Volcana had spotted him and bellowed in laughter, knowing full well that the Flash alone could not beat the both of them.

"I would advise you to put that down." he said, pointing at the bag of cash in Volcana's hand.

She pointed a finger at him and shot fire at him, in which he simply dodged quickly.

"That all you got?" challenged the Flash as Volcana shot fire at him again, which he dodged quickly.

He sped towards her and was about to punch her, when something hit him on the stomach – hard, that caused him to fly backwards. The Flash got up shakily and looked up, to see Bizarro and Volcana grinning at him evilly. Volcana was about to shoot fire at him once again, when a soft but commanding voice came out from behind them. "Hey!" A large chuck of broken pavement smacked Bizarro on the back, causing him to roar in outrage and turn around.

The Flash smirked.

'Probably Diana' he thought.

He stood up quickly and brushed himself off. When he looked up, he was just as surprised as Bizarro and Volcana. Standing 30 metres behind them, was a beautiful girl that was in need of a haircut, no older than 16 years of age, and a boy who closely resembled a latino-elf with a tool-belt around his waist. Bizarro and Volcana burst into laughter yet again.

"You think you can beat us?" laughed Volcana.

"Leave now and we'll spare your lives."

The Flash would've winked at the girl, or would have given her a charming smile, if it weren't for the situation they were in.

"Get out of here, it's not safe." he yelled.

But the teens ignored him.

"You think, that just because you are bigger and have special abilities, that you can beat us?" asked the boy, followed by a smirk.

But Bizarro was impatient charged at the girl. The Flash raced towards her and pushed them over, causing Bizarro to crash into the wall behind them. "What are you doing?" hissed the girl angrily while she stood and helped the boy up. The Flash looked at them in confusion.

"You were about to be pulverized by Bizarro, get out of here, it's dangerous." commanded the Flash.

The boy gasped.

"Wait a second…you're the Flash! But how is that-"

"Leo, we don't have time for that, yes I know it weird to have your favorite comic-book character in front of you, but have you forgotten that we are in the middle of a battle here?" said the girl with a roll of her eyes.

"Right." said the boy.

He reached in his tool belt and took out a polished bronze hammer with multiple buttons on it, while the girl unsheathed a very clean and sharp knife. "Uh… I don't think a knife would…" but the Flash was cut off when the girl jabbed at Bizarro's chest, and caused him to stumble backwards, and yet the knife wasn't even dented.

Volcana advanced the boy, the Flash grabbed his arm and was about to speed off, when the boy pushed his arm down.

"I got this." smirked the boy as suddenly, Volcana shot a large line of fire at him.

The Flash's eyes widened as the flames engulfed the boy.

"No!" he cried, but when the fire died down, the boy was still there, and looked unharmed.

Volcana and the Flash looked at him in shock.

"You done yet? Cause it's my turn." smirked the boy as he grasped the hammer with both hands and suddenly a small flame appeared in the palm of his hands and it grew on the bronze hammer.

He then shot the hammer at Volcana, instantly knocking her out. The boy pressed a button on his watch that was made of the same bronze as the hammer and it flew back into his hand. The two of them both suddenly remembered that Bizarro was still fighting the girl alone. They turned around quickly, only to see Bizarro standing in front of the girl who was talking to him soothingly.

"-and remember that Superman and the Justice League is your true hated enemies, while Lex Luthor is your best friend." she said.

She flashed Bizarro a sweet smile.

"Now go." she commanded.

Bizarro nodded in a daze, before flying off. The Flash looked at her in shock, while the boy simply smirked at shook his head.

"Really Pipes? You really couldn't think of any other way to stop him?"

The girl rolled her eyes.

"Hey I never knew your hammer could do that." she said.

"Well after the um… thing, I tinkered with it and added new features that would…er…suit my awesome powers." said the boy.

Meanwhile, the Flash still looked at them in confusion.

"How did you get Bizarro to do that? Who are you?"

"So you're The Flash, the fastest man alive." said the girl, ignoring his questions.

The Flash smiled proudly.

"Yes, yes I am."

"So, can you tell me all about the Justice League?" she asked, giving him a sweet smile.

The Flash felt his legs go jelly as he saw it and nodded. He soon found himself telling the two everything about the Justice League, even the secret codes and passwords.

"Alright, alright, I think that was all I needed to know, thank you, Flash." said the girl, and with that she turned to the boy and told him something the Flash didn't hear.

It was only then, was when the Flash realised that they were leaving.

"Wait! Where are you going?" he asked.

The girl raised an eyebrow at him.

"Home." she said in a 'duh' voice.

"But you didn't even tell me who you are." said the Flash.

The girl paused for a moment while the boy took out a long bronze canister out of his tool belt and placed it on the ground. He then pressed a button on his watch and the canister grew into a bronze 2 metre high dragon. The Flash as well as the rest of the civilians stared at it amazed, while the girl gasped. "You fixed Festus?" she asked happily.

But the boy shook his head sadly.

"No, he's still the mask head for the Argo II, but I finally figured out how to build one so I did. This is Butter, I know, I know, weird name. But he has this obsession with butter and you can easily calm him down by simply saying the word." said the boy.

"Butter, sit!" he commanded.

Immediately, the dragon made a sound that was probably meant to be a bark, and sat down on the ground with a loud crash, but not before showing off his fire-breathing skills by blowing a huge column of green fire in the air.

"Yeah, I got it to breath Greek fire as well." said the boy proudly.

"Oh, and for your earlier question." began the girl as she settled down behind the boy on the dragon.

The still awestruck Flash turned his attention to her.

"You don't need to know my name." she said.

The Flash raised his eyebrow, confused.

"A phone number maybe?" he asked.

But the girl shook her head.

"Sorry, I don't have a mobile phone, but don't worry, we'll see each other again."

And with that, the two of them flew off. The Flash sighed as another chance to get a girlfriend had just flown away, but what he didn't know, was that very soon, he would see her again.


"Hazel, where are we?" asked an annoyed Nico di Angelo as the two child of the dead stood and brushed themselves clean after they've stumbled into a cave.

"I don't know." sighed Hazel.

"I told you, you need to focus, focus, focus. If you want to learn how to shadow-travel, you'll need to focus on where you want to go, or else we'll be in situations like this." grumbled Nico, exasperated.

"Where are we, though?" wondered Hazel.

Nico tipped-toed forwards and let out a small yelp as he realised that he was stepping on the edge of a cliff. He heard distant waterfalls as Hazel placed her hand on the walls.

"It's damp and mossy." she exclaimed.

"You wanna bet that there's a water fall in here?" said Nico.

"There's a tunnel to your right." Informed Hazel.

"It's pitch-black, how would you know?" he asked.

"I just do." said Hazel simply.

"Feel like exploring?" asked Nico.

Hazel shrugged.

"I've got nothing better to do anyways."

The two of them tip-toed towards the tunnel and walked cautiously through it, with their hands on their weapons. As the sound of waterfalls grew louder, Nico began to notice bats hanging off the roof of the tunnel, a lot of them. "Um…Hazel? Look up." he said slowly.

Hazel frowned and looked up, only to scream slightly at the sight of the deadly creatures of the night.

"Pluto, where are we?" she cursed as she quickened her pace to get out of the tunnel.

"It's Hades." grumbled Nico.

"Whatever."

The two of them finally made it to the end, and in front of them, was a huge cavern, nearly as big as the Olympus throne room.

"Wow." commented Hazel.

Nico could only nod as he examined the place. There were platforms and walkways build in the middle of the cave, on the bottom was a large lake of water. Two waterfalls flowed down the sides of the cave and a massive bat symbol hung from the ceiling in the middle. Apon the platforms were various vehicles and computers.

"No…it can't be…" said Hazel, shocked.

Nico frowned.

"What?" he asked.

"Look, you know how you said I needed to focus when I shadow-travel? Well, I was thinking of camp, but I was also thinking of how as a kid, I used to read Batman comics…" said Hazel, trailing off to let that sink in.

Nico widened his eyes.

"No…it…it can't be…I mean, Batman's just a fictional character-" but he was cut short when the loud whirring sound of the bay doors opening.

A large, black car with bat-like wings sticking out from the back drove into the cave and straight into the middle space. The door of the car opened as soon as the engines turned off and a black figure hopped out of the driver's seat. "Oh my-" but Hazel quickly covered her half-brother's mouth with her hand before he could finish his sentence.

Unfortunately, the figure heard him and turned immediately towards their direction.

"Who's there?" yelled the figure, his bat-like cape flowing behind him.

The two of them kept quiet as Batman's eyes narrowed.

"I know you're there, show yourself." he warned.

Still no answer, so Batman grumbled and took out a bat-attracting batarang, and threw it straight at where the two teens were. Hazel and Nico ducked and the batarang flew in the tunnel. Nico grunted, but both of them froze when they heard a beeping sound, followed by the loud screeching of bats. Suddenly, all the bats they saw – which were quite a lot of them – flew out of the tunnel, pushing them over the edge and causing them to tumble out of their hiding spot.

"Get out of here!" yelled Nico as he grabbed Hazel's arm and shadow-travelled out of the place, leaving a very disturbing thought for Batman to wonder how on Earth two teenagers had ended up in the Batcave.

A/N I hope you enjoyed the first chapter! I know Thalia is afraid of heights and cannot fly, but let's say that at the end of the war, Jason taught her how to and she could. Thanks for reading!