New twist on an awesome crossover. Hope you enjoy.

Disclaimer: I don't own Heroes of Olympus or the Avengers. Rick Riordan and Marvel do.

*Helicarrier, over New York City*

"Sir, we have another alert, in L.A." Maria Hill, Fury's second in command, called from the desk of one of the agents. Fury glanced at Hill, and sighed.

Agents wee running around like bees in a beehive, carrying reports and threats and warnings of danger. Several screens were blinking red, and alerts were popping up everywhere.

"What is it this time Hill?" Fury asked, an annoyed tone slipping into his voice.

Hill lowered her head and said "Massive energy surge on an abandoned lot near the center of the city."

Fury waved it aside as someone brought him another threat from a gang in New York.

"Sir, another energy spike, this time in Central Park. Much smaller then the last, by almost 37%." Another agent reported, tapping furiously at the keyboard. Fury sighed as another agent walked over and said "Sir, there's someone waiting for you in the meeting room."

Fury straightened. His source was here. He looked around at the room of agents and said "I'll be in a meeting for the next ten minutes. If you have something world ending or human race threatening, give it to Hill. I am not to be disturbed, is that understood?"

Everyone nodded and watched as he strode across the room and entered a doorway just beside the main entrance.

The room was darkly lit, only a table and two chairs occupying the space. A man in a pinstripe suit stood half in shadow, a scowl on his face. His beard looked like a thundercloud had attached itself to his face, and he thought he saw a flash of lightening. But it was only the lighting.

"And who might you be?" Fury demanded, hand creping for the gun at his hip for assurance.

"You touch that weapon and I will bring down the wrath of the sky on this place." The man threatened, his electric blue eyes flashing like a thunder storm. He took a seat on one of the chairs.

"Remain standing." The man commanded as Fury made to sit down.

"Listen sir, I have a busy job and you seem like a very busy man, so if can we get to the point of your meeting here." Fury said.

The man studied him with his glowing blue eyes and said "You are aware of the 'disturbances' across the country popping up lately?"

Fury nodded. It was a weird question, but Fury was used to weird questions. You got used to them in the line of work he did.

The man stood and brushed an invisible speck of dust off the lapel of his suit.

"Beings are stirring, beings that haven't for hundreds of millennia. Due to the…events, this summer, war is coming. A war you mortals will not be able to handle, not even with your Avengers."

Fury crossed his arms and frowned.

"And what do you suggest I do?"

The man crossed his arms and breathed heavily through his nose.

"Due to the pleading my brothers and my arrogant nephew have badgered me with, I have decided, on behalf of the council, that we will assist you. My son Jason Grace will come and assist you with the disturbances."

The man stood to leave and said "You have two weeks to find these disturbances and eradicate them, or we will be forced into the problem. And that would make things infinitely worse."

A cold wind blew hard through the room and the man disappeared in the blink of an eye.

Fury looked around quickly and reached for his gun, slowly scanning the room, but the man had vanished.

He left the room and called out to Maria "Hill, I want every bit of information we have on Jason Grace. And assemble the Avengers!"

*Camp Half Blood, Long Island, New York*

Slash…slash...stab…slash…

"Jason!"

Jason stopped in hacking the practice dummy to pieces and whirled around, sword ready. Piper crossed her arms and asked "Joining to stab your girlfriend?"

Jason lowered the sword quickly, flushing and said "No, of course not."

Piper smiled and said "Chiron wants to see you. Something about a mission in New York."

Jason nodded once and sheathed his sword, walking towards the Big House.

Piper fell in step beside him.

"What do you think this mission is?" she asked lightly, brushing a strand of hair from her eyes. Jason watched the movement before blinking and shrugging.

"I don't know. Your guess is as good as mine."

Piper smiled and he felt her cool hand slip into his hand.

"Hope it's just a quick mission, like picking up milk. I don't want you gone all summer." She said.

Jason smiled at her and said "I hope so too. Two summers fighting wars is enough for any demigod."

Piper stopped at the porch and turned to leave, calling out over her shoulder "Come find me after." Before she was gone.

Jason nodded to himself, and entered the Big House.

Compared to the hot, bright weather outside, the Big House was dark and cool. The tribal masks hung on the wall, grape filled eyes watching him walk past. Chiron was sitting in his wheelchair, watching the demigods outside play volleyball.

"Jason, good to see you." He said, gesturing to a couch. Jason sat and asked "What's this about mission in New York?"

Chiron seemed to deflate, the smile on his face forced. Jason frowned and asked "What, is something bad happening?"

Chiron let the smile fall from his face and he sighed quietly.

"I was hoping that this summer would be peaceful, that there would be no more battles. You all deserve the rest of your lives in peace for what you've done."

Jason felt his hopes of a milk run drop down along with his gut, hitting the floor and sinking to rock bottom.

"There cannot be another war. I though Gaea was the last vengeful goddess?" he demanded, standing.

Chiron said "There is another war on the horizon, but there is hope that it will not come to that. The Olympians are worried. Tartarus has never stirred before"

Jason felt his heart skip a beat. Neither Percy, Annabeth nor Nico ever talked about what they saw in Tartarus. But Jason understood enough that it was bad down there. Worse than bad.

"The pit. It's stirring?" he asked. Chiron nodded solemnly and said "Monsters are forming faster. They don't form immediately, but notably. And they are getting faster by the hour. In two weeks, it will be like last summer. Forming immediately. Monsters are starting to mess with the mortal world. Mortal deaths, mortals vanishing into thin air, strange accidents. And they're escalating."

Jason felt his hands shaking. Not another war. He'd fought in two already. Wasn't that enough for the Fates? Weren't the gods done with him yet?

Chiron placed a hand on his shoulder and said "I know you are the last person who needs this, but the Olympians have already voted. They need your help. They would send Pe…Percy with you, but he is, unable at the moment."

Chiron sighed and turned back to the window, his eyes distant and sad watching campers outside. Jason had actually gotten along with Percy, after getting to know the guy better, he was kind of cool. He went on a mission for Chiron two weeks ago, and he hadn't come back. No messages, no clues about where he was. With no contact, Chiron had assumed the worst. And with Percy's luck, it was probably worst scenario material.

Jason took a deep breath and said "you said something about this not coming to a full out war."

Chiron nodded and turned back to Jason.

"The best mortal organization has also noticed the mortals, their director being clear-sighted along with several of his secret agents. He has, albeit reluctantly, agreed to let you work with his top team on the case. You will be leaving for their base in ten minutes."

It took ten seconds before the words sunk in.

"I have to go work with mortals, on something to do with the gods! They won't understand. This will be like a joke to them!" Jason shouted. The winds picked up outside, the shudders clattering against the walls. Chiron looked him in the eye and said "It will take you no less then two weeks. It's right in New York, and you won't be far from camp if there's an emergency. And the director has said that Piper and Leo can come visit you in a couple days, after you and the team have, in his words 'finished trying to kill each other'."

Jason crossed his arms and said "Two weeks. That's it?"

Chiron nodded and Jason nodded.

"Guess I have no choice then."

Alright, same story, same name, mostly similar details, just polishing up a few things.