A/N: Hello, everyone! This is Kittenclysm, coming to you with my third fanfiction, Code: Mutation. If you read about this in one of my other fanfictions, you already know that this is a crossover of Nickelodeon's Teenage Mutant Ninja Turtles in 2012 and Code: Lyoko before Evolution. I'm only doing this before Evolution because I can't find an English dub of that anywhere. By the way, when I imagined this story, I thought that they would all be a year ahead, Jeremie and Aelita would be together and Yumi and Ulrich are together.

Just for my own promotional reasons, my other crossovers are Of Gems and Mutants (2012 TMNT/Steven Universe) and Miraculous Guardians (W.I.T.C.H./Miraculous, Tales of Ladybug and Cat Noir.) A lot of the chapters of those fanfictions will say that they were written by LatinButterfly20, but that was my username before I changed it to Kittenclysm. But please check them out if you want. Anyway, let's get on with the story!

Disclaimer: I don't own Teenage Mutant Ninja Turtles or Code: Lyoko.

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Chapter 1)Dreams

Aelita ran behind her father outside as he ordered her. He blocked the back door with a plank of wood that lying in the grass.

Franz opened a door that was hidden behind some weeds that Aelita had never noticed. "Follow me," he said. When he entered, however, Aelita instantly lost sight of him, as if he had just walked into the abyss. "Daddy!" the young girl cried.

She tried following, but was stopped when three men in black suits stepped out from where Franz Hopper had vanished.

She gasped and turned around to run, only to see that more men had broken the wooden plank and starting to surround her.

She saw an opening between two men and slipped through them.

She quickly ran back into her house, planning on running out the front door.

She gasped when she saw four Kankrelats, blocking her only escape.

Aelita ran up the stairs as the mechanical monsters fired lasers at her. She turned around and saw both the Kankrelats and men in black following her.

She ran into her room and locked the door behind her.

She turned around and noticed a computer she had never seen before.

On the screen was a weird symbol that looked strangely like an eye.

She approached it as she heard banging on the bedroom door. A familiar woman appeared on the computer, surprising the young girl.

"Mommy?"

"Aelita, help us," her mother said in a distorted voice. It sounded as if a man was talking along with her.

"Mommy!" Aelita screamed, grabbing the screen.

"Aelita, help us," she repeated. "'Us'? What do you mean 'us'?"

The screen shut off and a bang from the bedroom door drew her attention away from the computer.

She turned around and was mortified to see the door's hinges were breaking and about to fall off.

Aelita cowered in fear as the door finally broke down and the monsters and men piled into her room.

The last thing she remembered was the sound of lasers being fired and her own screams.

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Aelita screamed as she jolted upright in her bed. She rubbed her eyes and looked around her room.

She sighed in relief as she realized that the entire thing was just a dream, and she was in her school dorm.

She grabbed her cell phone, getting ready to text Jeremie about her nightmare, until she saw the clock.

2:30

She realized it was too early in the morning and that he wouldn't be awake for another three and a half hours.

So, she decided to leave him be and try to get some more sleep.

She closed her eyes and tried to sleep, but her mother's distorted voice kept ringing in her mind, keeping her up.

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"No way."

"Yuh-huh."

"No, Odd."

"Yeah, Ulrich."

The two boys were having another disagreement, like the others.

They carried their breakfast trays to their normal table where the rest of their group sits.

"Jeremie, will you talk some sense into him?" Ulrich said to the blond genius. "Alright," Jeremie said with a sigh, "What is it now?"

Kolossus vs Mega tanks," Odd told him. "Well, that's a good one," Jeremie said, "How many tanks?"

"Ten," Odd said, "I say that if they position themselves just right, they'd be able to take him down!"

"And I say that there is no possible way!" Ulrich said, "The Kolossus has too much protection. The Mega tanks wouldn't be able to break that, let alone beat it!"

Yumi and William came up to the boys, carrying their trays.

"Hey, guys," Yumi greeted. She noticed the glare between Odd and Ulrich and instantly knew what was going on, "Okay, what is it this time?"

"Kolossus vs ten Mega-tanks," Jeremie informed them. "Oh, totally Mega-tanks," William said. "Thank you!" Odd exclaimed, getting a few students' attention.

"I doubt it," Yumi said, "It took four towers to control the Kolossus, but the Mega-tanks could control themselves. It has too much power."

"What do you think, Einstein?" Odd asked."That's pretty hard to figure out," Jeremie replied. "Too bad we can't turn the supercomputer back on," William said. "He thought for a minute, then said, "Wait, can we?"

"No, William," Jeremie said, "It's too dangerous."

"How? We killed X.A.N.A., remember?" Yumi said. "I don't know. I just have a bad feeling," Jeremie told them. "Well, how about we ask the queen of Lyoko?" William said, noticing the pink-haired teen coming up to them with her own tray.

She slowly sat down and rested her head in one of her hands, using the other to take small bites.

"Hey, Aelita, you think you can settle an argument between me and Ulrich?" Odd asked her. "Mmm," she moaned tiredly, barely paying any attention to the conversation.

"Well, I keep telling Ulrich that ten Mega-tanks could've taken down the Kolossus, but he seems to think…" Odd's voice faded out as Aelita started to think about her dream.

"Aelita, help us." The words kept ringing in her mind, not letting any other thought in her head.

"Aelita? Aelita," Jeremie said, nudging his girlfriend back to reality. "Huh?" She looked at the five people, looking at her in confusion.

Aelita, are you okay?" Ulrich asked. "Uh, yeah, just a little tired," Aelita answered.

"Well, we have classes this morning,do you think you can make it to the end of the day?" Jeremie asked. "Yeah, I think so," Aelita said with a yawn.

"Hey, Stones!"

They turned and saw Sissi, Herb, and Nicholas, coming over to them, the leader wearing an angry expression.

"Who do you think you are?" she said.

"Hey, lay off, Sissi," William said, "She had a rough night."

"Yeah, well, thanks to her, Sissi lost 90 minutes of sleep last night," Herb defended, "And if she doesn't get her full nine and a half hours, she can't think straight in class."

"Are you kidding? If her thoughts got any more curved, they'd be going in circles!" Ulrich joked, making his friends laugh.

Sissi growled and stormed off, the two boys following.

The gang looked over at Aelita again, only to see her fast asleep.

When they saw students start to throw away their trash and leave, Yumi nudged the sleeping girl, "Aelita, it's time to wake up, class is starting in a few minutes."

Instead of waking up immediately, she mumbled something about her father and men in black suits.

Aelita!" Odd shouted, nudging her harder. "What?" she asked. "Classes are about to start," William said. "Oh," she simply said. She grabbed her books and threw away her uneaten food.

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After what felt like a week-long day, Aelita trudged back to her room.

She threw her books and papers on her desk and dropped on her bed, almost instantly falling asleep.

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A/N: I hope you enjoyed this chapter. If you did, please read and review. I would also really appreciate it if you shared it with friends and whoever you think would like it. Also, I'm am completely open to any suggestions you have and I'll try to fit into the story. Anyway, thanks so much and I'll see you in the next chapter, MEOW!

-Kittenclysm