A/n:...I probably have some explaining to do. I'm going to be frank with you guys, I kept forgetting to update the chapters, and the fact that I was failing 2 of my classes and it was nearing the end of the year didn't help matters much. The school years almost over and hopefully I'll be able to update once a week like I said I was going to. Thank you IcyPinkFlower, James and iamthedoctor482 for reviewing in the last chapter.

iamthedoctor482- Oh! I know that show, my mom used to watch it (I'm personally more of a young justice fan), it could be possible that that episode was on and I was just sitting on the couch and that scene got suppressed in my memory but I honestly think its a coincidence.

Anyways I own nothing expect for the plot and OC's.

"Y-you bastard! Why would you do such a experiment? And on a child no less!" Sonic demanded.

"You see it's quite simple. Years ago I tried this very same experiment, however it was a complete and utter failure. My test subject died not long after the experiment was done. I spent years trying to figure out what I had done wrong, I had just about given up. Then your brother came along. He was able to see a fatal flaw I had overlooked and we fixed it. I needed to try it but I knew I couldn't try it on you or anyone else here. You were too old, you had already gone through puberty and your bodies for the most part are done growing. However Tails is like you said but a mere child. His body has much developing to do therefore I hypothesised that if I used it on him it would work."

"How can you call this a success! He's...he's...!" Sonic yelled unable to finish the sentence and allowing the forbidden word to die in his throat.

Robotnik laughed, "That is where you are wrong. Check again."

Sonic looked and saw that Tails was breathing once again. It was shallow but he was breathing.

"T-Tails," Sonic said hugging his unconscious brother.

"It was just a side effect of the serum, his body had to figure out how to accept it. Now if you'll be so kind as to let go of my test subject. We have many, many tests to do."

"No. I'm not letting you anywhere near my little brother," Sonic stated, tightening his grip around the boy.

"I thought you'd say that."

Sonic heard a buzzing noise coming from behind him. Turning around he saw 5 blue robot bees hovering behind him.

"Buzz Bombers attack! And get my subject at all costs!" Robotnik demanded before he left the room.

Sonic sidestepped one that tried to ram into him and then ducked at the one trying to attack his head. How the hell was he supposed to beat these things? He didn't know anything about mechanics. He could really use his brothers intelligence right about now.

While trying to dodge one he jumped up and ended up landing on it effectively crushing it.

'That's it! If I land on them they'll be destroyed!"

Sonic looked towards the remaining buzz bombers who were surrounding him. They were planning to rush him all at the same time.

"Come at me you bucket of bolts!"

The bee-like robots flew towards him. Once they were close enough for him to touch Sonic jumped up. The buzz bombers all crashed into each other destroying the head area, delaying their movement response and giving the teen enough time to stomp on all four at once. Out of the the wreckage of the robots came small forest animals. All 3 being small birds. If it wasn't for the dire situation he was in Sonic would have asked why there were birds in the robots.

Sonic ran out of the room, the birds following and ran to where the pods appeared. He pressed the button to summon one only to find out it wouldn't work.

"Damn it! He must have cut the power. I have to get out and fast!"

Sonic looked around rapidly for something, anything that could help him escape. He ran over to a table looking for something that could help him. While looking he saw a small vile that read 'Hedgehog serum'.

'This must be the same serum that made Tails part fox, except this one will make someone part Hedgehog. If I drink it maybe I'll have sharp enough quills to break through the metal. I don't want to…' Sonic glanced at Tails who was still unconscious in his arms.

'I have to do it. It's my last hope!'

Sonic chugged the serum. He fell to the ground and let out a scream of pain as hit grip on Tails weakened. He could feel the spikiness of the quills penetrating his skin and his DNA reforming to become hybrid. He could feel his consciousness slipping due to the pain, however he forced himself to stay awake. If he fainted now then all of this would have been in vain. When the pain started to subside Sonic put a hand on his back to feel the quills only to recoil it. He looked at his pointer finger and watched a the red liquid slowly start to leak out. He picked Tails back up and stepped into the now not working pod. He held the child close to him and as secure as he could so he didn't hurt him with what he was about to do.

"This has to work."

Sonic jumped up, curled into a ball and started to spin upwards. He felt his quills slice through the pod with ease and the force propel him upwards. Once he was in the donut shop he landed and ran out as fast as he could while the birds flew far, far away.

When Sonic got to the destination he was heading for, that being home, he almost ripped the door off its hinges. He placed Tails on the couch as he grabbed his school bag and dumped all his school supplies on the floor.

Tails let out a small groan and started to stir, "S-sonic?" The child paused at noticing how frantic his brother was moving around. "W-what's going on?"

"We're leaving. Can you walk?" He asked not even looking as his brother as he continued to shove anything he could into his bag that might be useful.

"Y-yeah I think so."

Sonic grabbed Tails bag and dumped out all of his school stuff out.

"Hey!" Tails exclaimed as Sonic shoved the now empty bag into his hands.

"Pack anything that can be useful that you can grab. Clothes, food, money anything!"

"But Sonic-"

"I'll explain later just listen to me!"

Tails flinched after his brother snapped at him like that. Sonic almost never did that, he must be really serious. Despite not knowing what was happening Tails complied.

Sonic ran into his room opened his closet. He pushed his clothes out of the way and picked up a small safe. After unlocking he pulled out a decently sized wad of cash and stuffed it into his wallet.
He had been saving any money he could somehow gets his hands on for emergency's. After years of doing so he had managed to make at least 200 dollars. He stuffed the wallet into his pocket and shoved his clothes into his backpack.

"Tails are you ready?" Sonic asked as he appeared in Tails door way.

Tails zipped up his backpack. Before leaving he grabbed a fox plush he had since he was young and turned to face Sonic.

"Ready."

Sonic picked up Tails and held him as if he was holding a small child, in which Tails responded by wrapping his arms around Sonics neck.

"Holding on tight," Sonic said before he ran. Ran away from his home. Ran away from his past. Ran away from his mistake.

"Hey Amy where are you going?" Knuckles asked as he caught up to the pink haired girl who was running.

"I'm going to Sonic's house."

Knuckles sighed, "Amy, Sonic is fine. He's probably just sick or something."

"Then I might as well check on him and see if he's alright," Amy replied as she picked up her speed.

When the two finally reached the Hedgehog house they noticed the front door was open. Sonic always made sure to lock the door before he left.

Amy glanced at Knuckles worriedly whose face became serious. They slowly walked into the house only to see that it was a disaster area. Cans and other utensils littered the kitchen floor.

"Mrs. Hedgehog?" Amy called out. Surely Sonics mom was home...right?

When their was no response Amy grew even more worried, "I'm gonna check Sonics room."

Knuckles nodded as Amy walked over to his room. As she walked towards it she felt as though she was a girl in some kind of horror movie. That at any second a monster would jump out and kill her. She walked into Sonics room to find in as just a big of mess as the kitchen. She chuckled to herself at this, it was just as messy now as it was when they were kids. She hadn't been to his house in about 3 years, some people just never change. She walked over towards his bed and looked. He wasn't there.

Amy stepped out of the room and back into the hallways. While making her way back down the stairs she noticed a picture on the wall. It was of a very young Sonic and Tails and their parents. Amy smiled softly, she hadn't seen Mr or Mrs hedgehog in such a long time.

She suddenly heard what sounded like buzzing coming from behind her. Amy whipped around to see a giant blue bee hovering behind her. She let out a scream before grabbing a nearby book and throwing it at the animal, only for the book to fall to the floor, the blue bee unaffected by it.

"Uh-oh!" Amy exclaimed before she started to run, the bee following her.

She ran until she reached one of the walls of the house. She pressed herself up against it and took off one her shoes.

"Stay back!" She commanded as she pulled her shoe back, getting ready to use it as a weapon if needed.

The bee came closer.

"I'm warning you!" Amy yelled closing her eyes.

Amy felt something touch her shoulder and hit whatever it was with her shoe.

"Ow! Son of a-"

Amy opened her eyes to see the blue bee had been turned into a metal scrap heap on the floor.

'So it was a robot? Wait if it's over their then who'd I just hit?'

Amy looked to her right only to find Knuckles their nursing the forming goose bump on his head.

"S-sorry. Are you okay?"

Knuckles stopped what he was doing and turned towards Amy, "I'm fine. How about you? That thing came awful close to attacking you."

"I'm okay. What the heck was that thing? It looks like it was some type of robot," Amy remarked as she started to expect the parts.

"It was. Question is, what was it doing here?"

"Do you think it could be a invention of Tails that went haywire?" Amy asked as she remember the 8 year old was a genius.

"It can't be. Tails is more into mechanics such as planes. Why would he go out of his way to build a robot?"

Amy nodded, "Good point. How'd you even beat this thing though? It's made of metal so I doubt you fists could have done much."

"Maybe alone but with these, my fists can do a lot of damage," Knuckles responded showing her his spiked brass knuckles.

Amy smiled as she remember how excited Knuckles had been at his 10th birthday when he got those from his father. It was a family heirloom that was passed down to each first-born once they reached 10 years of age. She also remembered how not long after he received said brass knuckles he almost ended up using them on a certain blue haired boy. Sonic. Amy suddenly remembered why they were their in the first place.

"I almost forgot! We can talk about this later, right now we have to look for clue of what could have happened to Sonic. I'm starting to get worried."

"Maybe Tails will know. We'll just wait for him to get out a the Elementary school and ask what's going on."

Amy nodded the two headed towards the Elementary that their little friend attended, hoping to get some answers.

"Sonic can we stop for a bit?" Tails asked as from upon Sonic's shoulders.

"I….already said….no," Sonic panted as he continued to run.

"Come on Sonic, you've been running for hours. You need to rest," Tails protested, his concern evident in his voice.

Sonic growled and came to a stop, "Okay fine we'll take a break," He grumbled as he plopped down on a nearby rock.

Tails sat down on a rock parallel from Sonics, "Sonic please tell me whats going on."

Sonic gave Tails a weird look as he regained his breath, "You seriously don't know?"

Tails shook his head, a sad look on his face, "Last thing I remember was seeing a dark figure picking me up. I thought it was you at first but then I saw a streak of red in its hair."

Tails noticed Sonic visibly stiffened at the mention of the figure. The child continued.

"I started to struggle but he said a weird phrase. After that, everything's a blur."

After his little brother was done recounting what had happened Sonic's eyes darkened and became filled with rage.

"Shadow. I should have known he was up to no good," Sonic mumbled under his breath before turning his gaze back to Tails, "Do you remember anything else that happened?"

Tails thought for a minute, "That phrase he said, It was Chaos something. Right after he said it though their was a bright light and I blacked out."

"I don't know what this whole chaos thing is about but Tails I want you to place your hand on your head."

"Why?"

"Just trust me."

The child did as instructed and slowly lifted his right hand and placed it on his head. He quirked an eyebrow as noticed something wasn't right. Something on top of his head felt...triangular and furry. Tails felt the object some more with a confused look on his face. He attempted to pull the object off of his head only to find it was stuck. Frustrated and wanting to know what he was feeling, Tails gave the appendage a sharp tug only resulting in a yelp to come from himself as he felt pain shoot through that part of his head.

"Sonic, what is it?"

Sonic gave Tails a grim expression, "That's one of your ears."

Tails stared at his brother in shock and disbelief. His eyes widened and his breathing and heart rate started to accelerate.

"You have another one on the other side of your head."

The child shakily raised his left hand and felt for his other ear, only to recoil it as though he had touched fire once his hand came in contact with said appendage.

W-whats going on? Sonic?"

Sonic didn't respond instead he said, "That's not all. Feel behind you."

He did as instructed and his eyes widened even more when he felt something furry. He pulled it to his side so he could inspect it better. It was a big fluffy tail. After some more inspecting he found it was not one but two fluffy tails.

"T-this can't be happening."

"You're not the only one who's different now."

Tails looked up at his older brother. Sonic turned around and Tails gasped when he saw the sharp quills that his brother now had running down his back and intertwined with his hair.

When Amy and Knuckles reached the Elementary school they saw that it was just beginning to let out. The two walked towards the school and began looking for Tails.

"Amy?"

The two teenagers turned their heads too see Cream staring at them with a confused look.

"Cream," Amy responded as the two walked towards her.

"Amy what are you doing here? Are you and Mr. Knuckles here to pick me up?" She asked. Usually she just took the bus home.

"No, we have to ask Tails something. Have you seen him?"

Creams frowned, "I haven't seen him all day. I don't think he came to school today."

Amy casted Knuckles a worried glance. Cream started to grow concerned, "What's wrong Amy?"

"It's nothing Cream. Come on we better get home," Amy responded grabbing her little sister's hand as she and Knuckles made their way through the crowd of children

As she dragged her little sister away from the school and towards the bakery they called home she made sure the keep her head down as a single tear slid down her face. She couldn't keep hiding from the truth. Sonic and Tails were missing.

A/n: I'm so tired and need to sleep so bye!