Hello! This is my very first upload, so please don't hate me! :) I've never really shared my stories with anyone (because most of the people I know aren't that into fanfiction...their loss...) Anyways, I own neither the TMNT or the concepts created by Rick Riordan (if you don't know who that is, there's always Google! ^-^) Enjoy! Reviews welcome!
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Chapter One: Graecus

"Ah, the Battle Nexus tournament!" Mikey exclaimed. "We made it!"

"Sure did," his brother, Donatello, answered. "Again."

"I can't wait to take home another trophy!" Mikey went on.

Behind him, Leonardo and Raphael rolled their eyes. Their father, Master Splinter, walked up to a tall figure dressed in royal garb and spoke with him for a few minutes. Below them, in the arena ring, the qualifying rounds were beginning.

"Behold! My awesome splendor!" a large Triceraton they all knew as Traximus roared. He was standing in the ring, ready for his challenge. "Who will fight against me?"

"I will," a small voice answered. All eyes turned towards the northeast entrance where a slight figure dressed in ancient Greek armor stood. They wore a helmet that hid most of their face from the crowd. They carried a traditional hoplite shield, and the turtles noticed there were more than a few nicks and dents in it. They carried a Greek sword, and it seemed to glow in the dim light of the evening. The challenger was barefooted, however, showing off strangely small feet and calf muscles for a warrior.

Traximus roared with laughter. "And who is this? Surely you cannot fight me! You're but a child!" He laughed harder. "I will not go easy on you, child in strange armor. State your name to the crowd, and let us begin our battle!"

The small warrior stood with their feet shoulder-width apart. They turned to the crowd and beat their sword on their shield in true Greek fashion.

"I am called Achilles!" No bragging about fighting in wars, no trying to build himself up. A simple name, that was it.

Donatello gasped. "It can't be. That can't be the Achilles."

"Who's Achilles?" Mikey asked him.

"A famous Greek warrior," Leo answered him. "Legend says that he was descended from a goddess, and dipped in the river Styx to make him indestructible. He was a military genius."

"But his mom, the goddess," Raph continued. "Had to hold him by a spot on his heel to dip him in the river, and that was his weakness. That one tiny spot."

"Oh!" Mikey exclaimed. "The Achilles' heel!"

"Exactly," Donny told him. "But the Battle Nexus doesn't find warriors from the past to compete. Just current ones. Which means this Achilles is just someone who's trying to live up to an impossible legend."

"Well, they're obviously from Earth, because they know the legend. Maybe we should introduce ourselves," Leo suggested.

"Yeah. We'll go wait in the infirmiry," Raph laughed. "This battle shouldn't take too long."

They watched as the fight began. Achilles and Traximus circled each other. After a while, Traximus began to taunt the small warrior. But, the warrior never rose to the challenge. They kept still, waiting. Finally, the Triceriton lunged, and Achilles ducked and rolled out of the way. They rolled under the Triceraton, slashing with their sword as they went. They stood up behind him, and he turned around...

...just to have his pants fall down.

He cried out and scooped to pick them up, much to his embarrasment. He glared at Achilles, but the young warrior just grinned at him. Traximus lunged again, this time angry. But Achilles was ready for him. They jumped and landed on his arm, then jumped again. They thrust out their sword, aiming for the exposed area between the neck and shoulder on Traximus's armor. But before the sword tip touched him, Traximus disappeared. Achilles landed in a crouch and pulled something from an enclosed compartment. They touched it to the tip of the sword, and the sword vanished. Achilles put something back in the compartment and stood.

The crowd was silent. In a few short minutes, this Achilles had dispatched the tournament favorite. Without a word, Achilles calmly marched off the field of battle, clearing it for the next fight. The turtles watched as they met with five other figures in the entrance tunnel, then they all walked away.

"That was...unexpected," Donny noted.

"What was it you were sayin' about livin' up to a legend?" Raph asked his purple-clad brother.

"Come on," Leo said. "Let's go talk to Traximus. Maybe he can provide some answers."

A/N: Graecus is Latin for "Greek". The Romans sometimes meant it to be an insult for an outsider or an enemy. (Found in "The Son of Neptune" by Rick Riordan...love ya Rick!). A Hoplite was a Greek footsoldier in the times after the Trojan wars (that's in the BC half of the world timeline).