I'm sorry it took me over a month for this. I'm a terrible person.

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Credit goes to Rick Riordan and the creators of One Punch Man

Hospital in Manhattan:

One Sally Jackson gave birth to a newborn baby, who was named Perseus Jackson. The baby was slightly tanned, with tufts of raven black hair and beautiful sea green eyes. Unbeknownst to anyone, this baby demigod would grow into the most powerful entity to ever exist, and cause ripples of change throughout the divine world. The reason? An unseen rift in the fabric of spacetime, caused by one man from the future. His name was Saitama. And at the same time, another child was destined to grow as powerful as Perseus Jackson. Her name was Thalia Grace. And the one who changed her entire destiny was one named Garou.

Together, these heroes and monsters will change the world together.

Chapter 1:

Percy sat in the bleachers, hidden in the shadows as Grover entered the gym with three people tagging along. Percy's eyes swept over the group, and locked eyes with a girl with short, spiky hair and striking blue eyes. Then something tapped him in the shoulder. Percy turned around to see Dr. Thorn, who waved his hand in a follow me gesture. Percy stared for a moment before sighing.

I hope this will be interesting.

A few minutes earlier:

The van traveled north through the storm, and stopped in front of a school that looked like a castle, with slit windows and towering double doors. Annabeth, Thalia and Bianca stepped out into the snow, which crunched under their weight.

"Thanks, Argus," Annabeth said to the hundred eyed man. Argus winked one of his eyes and headed back to Long Island, leaving the trio standing in front of the ominous building.

"This'll be fun," Thalia said.

"What do you think he found?" Bianca asked.

Thalia shrugged. "Only way to find out is to go in. Let's go."

The three entered the entry hall, the oak doors slamming behind them. Not even ten seconds had passed before two people stepped out of the shadows. They wore military uniforms with red trim, one a woman with a wispy mustache, and the other a clean shaven man with heterochromia, one eye blue, the other brown.

"And who are you three?" The woman demanded.

Thalia stepped forward and snapped her fingers, a gust of wind rippled from her hand and throughout the hall, disturbing the banners on the wall.

"We go here, remember? I'm Thalia, and this is Annabeth and Bianca. We're in eighth grade." As she said that, the woman's eyes glazed over as the man narrowed his eyes at the trio.

Then he looked at the woman. "Ms. Gottschalk, do you know these students?"

Ms. Gottschalk blinked once, twice. "I believe I do, sir. Thalia, Annabeth, Bianca. What are you three doing away from the gymnasium?"

Grover came running down the hall at that moment, out of breath. "You made it! You-" He paused after noticing the teachers. "Oh, Ms. Gottschalk! Dr. Thorn! I, uh-"

"What do you mean, they made it? These students live here," Dr. Thorn snapped, clearly annoyed by the satyr.

"Oh, of course, sir," Grover said nervously. "I meant… the punch for the dance! The punch is great. And they made it!"

"Yes, the punch is excellent," Ms. Gottschalk said dreamily. "Run along now, you are not to leave the gymnasium again!"

Grover pulled the trio closer to the gym and turned. "Thank the gods you got here!"

"What's the emergency?" Annabeth asked. "What did you find?"

Grover fidgeted nervously. "I found a half-blood, but…."

The three girls looked at him. "But what?" Bianca asked.

"His scent is strong. Stronger than yours-" Grover pointed at Bianca, "-and even Thalia's. He might be another child of the Big Three."

"Just who is he?" Annabeth asked.

"His name is Percy Jackson."

After Thalia made eye contact:

Thalia's eyes widened. Thalia knew she'd seen someone like him before… but when? She hadn't even met him before, and yet she knew him.

Who was this kid? Thalia thought. She turned back to look at him again, but a pack of girls wearing high heels and spaghetti straps blocked Thalia's view, and when they'd passed, Percy had disappeared. She turned back to her group, and noticed that Bianca had also noticed Percy's disappearance, and had already gone through the exit, the door swinging shut behind her.

And so, left with no choice, the two remaining demigods plus satyr followed Bianca.

Skipping the part where they walk with Thorn because the author is a lazy asshole:

Percy heard the crunch of snow behind him as he and Bianca were shoved over by an invisible force as Thorn, completely taken by surprise, shot a volley of projectiles that flew over their heads. Percy decided to sit up to watch the show.

Thalia and Grover charged, With Thalia holding up a shield, the Aegis, which was engraved with the face of Medusa. Thalia took out a Mace canister and it unfolded into a spear, and Thorn winced and growled at the sight of the shield.

Thalia shouted a battle cry. "For Zeus!"

Thalia jabbed with her spear, but Thorn swatted the spear away. His hand was now an orange paw with sharp claws that shot off sparks as it raked against Thalia's shield. She rolled backwards after the strike and landed on her feet.

Dr. Thorn launched another volley of thorns from a scorpion tail that bristled with spikes on the tip. Aegis deflected the volley, but the force knocked Thalia off balance. Grover jumped forward, playing his reed pipes, and played a frantic jig like one that pirates would dance. Grass broke through the snow around Thorn's legs, growing quickly into ropes and entangling Dr. Thorn.

Thorn roared, annoyed, and he changed to a lion with a human face and a scorpion's tail.

"A manticore!" Annabeth shouted, now taking off the baseball cap that had made her invisible.

Thorn fired another volley, and they ducked. Grover fell down to the ground with a thud.

Maybe I should start helping, Percy thought as he stood up.

"Yield!" Thorn roared.

"Never!" Thalia yelled, and she charged at Thorn. But before that could happen, a military grade helicopter appeared from the mist, with laser guided rockets attached to the sides, with a spotlight trained on Thalia.

As the spotlight blinded Thalia, the manticore swatted aside her shield, knocking Thalia back, and fired a volley of spikes at her. Right before Thalia was impaled, she disappeared, and reappeared a few feet away, a body shielding her from Dr. Thorn.

"Who are you?" Thorn asked. The person smirked.

"I'm just a hero for fun," Percy said, standing up and facing Dr. Thorn, who stared in resentment.

I'm starting to get deja vu, Percy thought to himself. As Percy was doing that, the manticore lunged at Percy, right as a hunting horn resounded throughout the clearing. Then Thorn got punched in the face.

Ok

- Saitama

I'm sorry. I regret posting this chapter out so late even though I made myself a deadline to post this by two weeks ago. Also, you might see some similarities to the original chapter because I didn't have time to think of more stuff. It's probably terrible quality, so I'm sorry about that too. See you in the next one.

- spectre646