It's been long since Sonic left Canterlot High School in both Mobius and CHS, for time went the same way it did for both universes. A year since Sonic had last seen his best friend and girlfriend Rainbow Dash. Ever since Amy had known about that, she wasn't with Sonic's team anymore and left Mobius to try and find a new life in a different place.

Our story starts with, yep you guessed it, with Sonic the Hedgehog running along Green Hill Zone doing his usual stuff. Though he was enjoying his life back home, he really missed Rainbow. "Man, I really miss her. I wish there was a way to go back and see her," he thought.

Then as he was still running, he heard someone talking to him in his head, "Sonic, it's me Shadow, can you hear me?" it asked.

Sonic slowed down and stopped running so he could focus and communicate with Shadow, "Yeah, I hear you Shadow, what's up?" Sonic asked.

"Meet me, Tails, Silver, Knuckles, and Manic at Angel Island. Tails said he has a surprise for you," Shadow said.

"All right, I'll be there," Sonic said as he then ran down the path to get to Angel Island.

Later, Sonic arrived at Angel Island. Tails, Knuckles, Shadow, Silver, and Manic were waiting for him near the Master Emerald's resting place. "Hey guys, I'm here," Sonic said.

"Glad you came, bro," Manic said, "Check out what Tails made."

Sonic saw that Tails was working on his arm cannon. "Oh, don't tell me he's trying to travel to a different universe again," Sonic stated.

"Actually, this is our way back to CHS," Tails said.

"I don't think that's a good idea, 'cause- wait, really?" Sonic asked.

"Yep, and I tested it out, and guess what? It works," Tails said.

"D-does this mean I'll get to see Rainbow Dash again?" Sonic asked.

"Mm-hmm," Tails answered, "And we decided to come along as well. We have the Chaos Emeralds. Here, you take two of them," he gave Sonic the blue and cyan emeralds.

"All right," Sonic said as he took the emeralds, "So are we gonna go?"

"Yeah, we are," Tails said as he activated his arm cannon and fired a bright yellow beam.

Where the beam fired opened a white vortex, the portal back to Canterlot High. "Leaders go first," Tails said.

"Wait," Sonic started, "Are we going to end up looking the same, or turn to humans?"

"From my calculations, yes, we'll turn into humans," Tails answered, "Oh, and just before we go, look what I've got."

Tails tapped a button on his arm cannon, and a screen appeared on it. Sonic and the others looked at it and they saw some things on there that surprised them each. They were items from the Mushroom Kingdom; Fire Flowers, Super Mushrooms, 1-Up Mushrooms, Raccoon Feathers, Cape Feathers, and Stars.

Tails said, "Mario decided that if we go on another adventure, we should use some of his items. He just gave me a lot of most of all items from the Mushroom Kingdom."

"Let's remember to give him and 'Thank you' note some time," Sonic said, "All right, let's go."

Sonic jumped in first excited to see Rainbow again. Tails jumped in next, then Knuckles, then Silver, then Shadow, and Manic last.

In the other universe, in Sugarcube Corner, we meet the human main six of Canterlot High and Princess Twilight Sparkle. Twilight was a lavender purple skinned girl with dark berry blue hair with two streaks; one violet purple and the other magenta pink, and violet purple eyes. She was wearing a light arctic blue button up shirt with a magenta purple bowtie, a lapis blue backpack on her back, a dark violet purple skirt with a picture of a pinkish purple starburst on the side with five small white stars around it, and dark violet purple and hot pink legwarmers on top of black dress boots. Where she lives, she's an alicorn pony.

"Oh, I do hate that you've had to return in a time of crisis. We have so much catching up to do," a girl said to Twilight. She had pure white skin, slightly dark violet purple curly hair with a cerulean blue triple-diamond hairclip resting at front, and cobalt blue eyes. She was wearing a light pale blue shirt that had elbow-length sleeves, an iris purple skirt with three arctic blue diamonds, around her waist was an dark violet purple designer belt with a cerulean blue belt buckle, on both her wrists were bright golden yellow bracelets, she was also wearing long violet purple boots with iris purple outlines at the top and a arctic blue diamond centerpiece on each boot. Her name was Rarity.

"For starters, a certain blue-haired guitar player was just asking about you," a girl said in a western voice. She had light orange colored skin, blonde yellow hair tied up in a ponytail that fell to the middle of her back, a few specs of white on both her cheeks, and bright green emerald eyes just like Sonic. She wore a Stetson tortilla brown cowboy hat, a white jacket with shamrock green in the middle, a light denim blue jean skirt with a walnut brown belt with a ruby red apple-shaped buckle on the front, and tawny brown leather boots with a logo of three ruby red apples on each foot. Her name was Applejack.

"Flash Sentry was asking about me?" Twilight asked excitingly while playing with her hair and blushing until she realized what she said and cleared her throat, "Isn't that nice?"

Twilight started to have her drink as Rarity lifted her cup of coffee and asked, "Perhaps you can just give us just the slightest bit of gossip from your world?"

"She's got an official title now," a dog in a girl's lap said in a young male voice. The dog had small iris purple fur, apple green eyes, parakeet green spiked up hair, chartreuse green ears, and a denim blue collar with silver spikes and a gold dog tag with a pink heart in the middle. His name was Spike.

The girl who had Spike on her lap had cream yellow skin, her hair was long and bright pink that fell to her waist with a white butterfly hairclip in it, and she had teal blue eyes. She was wearing a white tank top, a grass-green skirt with a few butterflies; two blush pink and one magenta pink, and grass green boots with a white design on the feet and magenta pink knee socks with white dots. Her name was Fluttershy.

Spike imitated a trumpet fanfare with his dog treat and said, "The Princess of Friendship!"

"Wow, that's really impressive. Guess you really were Princess Celestia's prized pupil," a girl said. She had yellowish-orange skin, bright red and bumblebee-yellow hair, and aqua greenish-blue eyes. She was wearing a black biker jacket over a magenta purple shirt with a bright red and yellow shimmering sun on the chest, a tangerine orange skirt with a magenta purple and blonde yellow streak on the left front, and black boots with a magenta purple design on the feet. She was Sunset Shimmer. From what happened at the Fall Formal, she became a demon only for power, but was stopped by Twilight and her friends, even Sonic. Now they were helping her make new friends.

"She's even got her own castle," Spike added.

"A CASTLE!? You have your own castle?" Rarity yelled getting in Twilight's face and spilled a small bit of Twilight's drink on her shirt, until she realized what she was doing and cleared her throat while wiping the mess off of Twilight's shirt with a napkin, "Ooh, uh, lovely,"

"What's new here? I mean, besides your school becoming the target of dangerous magical creatures from Equestria?" Twilight asked.

"Yeah, so that isn't exactly the only strange thing that's happened since you and Sonic left," another girl said. She had cyan-blue skin, rainbow hair, and pink magenta, violet eyes. She was wearing a short sleeve cerulean blue button up shirt over a white shirt with a symbol that looked like a white cloud with a primary colored lightning bolt on the chest, a bright fuscia pink and white striped skirt with tight-fitting black bike shorts underneath, a primary colored wristband on both of her wrists, and primary colored socks in cerulean blue converse style high top boots. Her name was Rainbow Dash and she was Sonic's girlfriend.

Rainbow Dash reached into her backpack pulling out her cell phone and showed Twilight a video of her playing a bright blue and red guitar while gaining pony ears, wings, and tail. This gave Twilight a little bit of a shock.

"Pretty sweet, huh? It happens to all of us when we play," Rainbow said, "And gosh, I wish Sonic was here to see it."

Twilight thought for a moment, "Hmm. My crown was returned to Equestria, but some of it's magic must've remained here in Canterlot High. Now that we're all together, we can use the magic on the sirens. Just like when we were able to use it on Sunset Shimmer. When she turned into that horrifying winged monster."

Twilight realized what she just said and turned to Sunset, "No offense."

"None taken," Sunset said sadly before she let out a smile to herself, "Huh. I'm used to it."

"They'll never even know what hit them!" Rainbow said excitedly before showing off some karate moves in front of her friends.

Applejack caught one of her punches and smiled, "We got nothin' to worry about now that Twilight's here."

"Oh, I'm pretty sure I could find something to worry about," Fluttershy said looking down before smiling, "But it won't be the sirens!"

"The sooner we do this, the better," Twilight agreed before asking the group, "Any idea where the Dazzlings might be?"

A girl waved her hand while drinking an ice cream float. She had fuscia-strawberry pink fluffed up hair, blush pink skin, and sky blue eyes. She wore a white shirt with a lavender pink heart at the middle and amethyst purple across the top of the shirt, a short sleeve cerulean blue jacket, a cerulean blue bracelet on each wrist, an amethyst bow around her waist, a lilac purple skirt with three balloons; two sky blue on the bottom with yellow strings and one sunflower yellow on the top with a blue string, and cerulean blue boots with white laces and pink bows on the top of them. Her name was Pinkie Pie.

Pinkie stopped waving to finish her drink and said while looking at the empty glass, "There's a big party tonight for all bands who signed up to be in the showcase. That would include the Dazzlings."

Everyone smiled at that thought. Twilight wiped a smug of Pinkie's drink from Pinkie's cheek, "Looks like we have a party to crash."

Later, at Canterlot High School in the party in the gym, everyone was in their own groups while glaring at others. The main six's group known as The Rainbooms and Twilight were at a snack table keeping an eye out for people who they called the Sirens. Pinkie was only stuffing multiple chocolate chip cookies in her mouth.

Two familiar teenage boys named Snips and Snails were showing off gang moves at students. Snips was showing a challenging move at Flash Sentry. Flash raised his fist and was about to punch Snips. But he then grabbed an empty plastic blue cup and sighed in frustration.

"I'm gonna get more punch," Flash said as he walked away from his band.

As he walked towards the table, he didn't watch where he was going. He and Twilight bumped into each other by accident. Twilight was about to fall when Flash caught her by her waist with his hand. When he saw her face, he looked a little surprised, "Twilight?"

"Uh, bumped… into… always… doing…" Twilight couldn't come up with the right words to say while she was slightly blushing.

Flash smiled and was happy to see his friend was back as he stood Twilight back up on her feet. "What are you doing here? You came back for the big competition, right?" he asked.

"Something like that," Twilight said.

"Huh, not that there's gonna be any real competition," Flash said proudly, "No one here wants it as bad as my band does. By the way, how's Sonic doing?"

"Not sure, but I would say he's doing pretty great," Twilight said.

While Twilight and Flash were talking, the main entrance doors to the gym opened. Rainbow Dash noticed three girls that were there. Those three girls were the Sirens, aka the Dazzlings. When Pinkie was about to take a bite of another cookie, Rainbow took a piece of chocolate from it and threw it at Twilight. It got stuck in Twilight's hair, interrupting Twilight's moment with Flash. Twilight pushed the piece of chocolate out of her hair and looked at Rainbow. Rainbow then motioned her eyes at the mysterious girls. Twilight turned and saw the three girls looking around and walking to another area in the gym.

Twilight then turned to Flash and asked as she slipped away, "Can you excuse me for just a minute?"

The other girls followed Twilight while Pinkie stashed some more cookies in her hair.

The three strange girls looked around and saw everyone arguing. The lead girl who had yellow skin with luminous vivid orange hair with luminous vivid gold highlights tied up in a puffy pony tail and violet eyes named Adagio Dazzle mocked a surprise, "Oh no! No one's mingling! It's like there's some kind of underlying tension that could bubble to the surface at any minute!"

Adagio was wearing a short lavender purple short sleeve jacket over a dark violet purple shirt, a gold belt with spikes and a gold emerald on the front, dark violet purple shorts with tight-fitting amethyst purple pants with a design of iris purple triangles, lavender purple fingerless gloves that went about two inches past her wrists, and eggplant purple heel shoes with the heels being wood brown with gold spikes on the back. She also had a black necklace with a red gem on the front.

The second girl who had cyan skin with moderate cerulean and dark blue hair tied up in a pony tail and violet eyes as well named Sonata Dusk looked at the drink in her hand and said worried, "It's the fruit punch, isn't it? I knew I used too much grape juice."

Sonata was wearing a raisin purple jacket with elbow-length sleeves, a magenta collar, a bit of cyan blue on the front, and a music symbol near the right shoulder, magenta purple wristbands with silver spikes on her wrists, a lilac purple skirt, and magenta purplish pink boots in a shoe design with white on the feet. She also had the same necklace Adagio had.

Adagio sighed, "It's not the fruit punch, it's US."

"But the punch is awful too," the third girl with purple skin, moderate purple hair with moderate turquoise highlights in two ponytails and purple eyes said. Her name was Aria Blaze.

Aria was wearing a parakeet green jacket with the sleeves looking like they were ripped off over a buttermilk tan shirt, three eggplant purple wristbands going hath-way through her arms, violet purple tight-fitting pants with long pockets that had white dots on the outside and a eggplant purple belt with a silver star in the middle, and short dark violet purple heel boots. Even she had the same necklace as Adagio and Sonata.

"What do you know about good fruit punch?" Sonata questioned Aria.

"More than you," Aria answered.

"Do not," Sonata protested.

"Do too," Aria protested back.

"This is just the kick off party, girls," Adagio said evilly, "Imagine what a tissy they'll be in when the Battle of the Bands starts."

"There isn't gonna be a battle of the bands," Twilight said getting their attention, "We're gonna make sure of that!"

Sunset Shimmer nodded as her friends prepared to attack the Dazzlings.

"All right, girls. Let's do this," Twilight said as she and her friends joined hands.

While they were doing that, white energy started to form above them. No one was noticing that except the Dazzlings who were looking worried about what was happening.

"Friendship is-" Twilight started when…

FLASH! A massive white vortex suddenly appeared above the groups. Everyone saw this and was shocked. Then the vortex closed as an object fell out of it and fell to the floor yelling, "WHOOOOAAAAA!"

The object flipped in the air and landed on its feet between the two groups. When it stood up, everyone except the Dazzlings gasped to see that it was a teenage boy. His skin was bright peach. He had admiral blue spiky hair with emerald green speed glasses in it, and green emerald eyes. He was wearing an unzipped cut sleeve cerulean blue vest hoodie with navy blue streaks on the bottom over a white long sleeve shirt with the sleeves folded up to his elbows. His lower half contained azure blue jeans with a couple rips to the knees, and bright red and white shoes with gold buckles on the sides and white sports tape on the front, middle and ankles. For accessories, he wore a bright chocolate brown colored bandana around his neck, on his hands were white fingerless gloves, white sports tape wrapped around the hands excluding the fingers going halfway up the lower arms, and even a sapphire blue wristband on each wrist. He was also wearing a bright cobalt blue backpack with bright scarlet red and gold yellow streaks on it on his back.

The stranger smiled at Twilight and her friends, mostly Rainbow. Rainbow looked at the boy for a moment before she spoke, "S-Sonic?"

The stranger smiled again. It was indeed Sonic. "Hey, Dashie. I'm back."

Rainbow gasped with tears of joy as she let go of her friends' hands, ran up to Sonic and gave him a bear hug while everyone else cheered that Sonic had come back. "Oh, I missed you, Sonic," Rainbow said.

"I missed you too," Sonic said as he returned the embrace.

Then Sonic and Rainbow kissed each other on the lips passionately and their cheeks flared up red while everyone else was still cheering. This made the Dazzlings confused. Twilight and the others came into a group hug with Sonic and Rainbow.

"It's great to have you back, partner," Applejack said.

"Oh, I'm so glad you've returned, darling," Rarity said.

Sonic saw Sunset who wasn't in the hug, "Hey, Sunset."

Sunset was a little surprised, "Y-you're not mad at me now?"

"Of course not," Sonic said, "You're different now, and what happened before is all in the past now."

"Thank you," Sunset smiled as she joined the hug.

"Hey, Sonic," Flash said as he walked over to the group and offered a fist bump to Sonic.

"Hey, Flash," Sonic said as he accepted Flash's fist bump.

"Ahem," Adagio spoke to get the group's attention, "Please forgive me for my rude interruption, but who is this boy?"

"I'm Sonic, Sonic the Hedgehog. Adventurer and the fastest thing alive," Sonic answered.

Adagio and her sisters were in utter shock. "He's a hedgehog? Then, that must mean he's from another world too," Adagio thought.

Then the white vortex opened again surprising everyone and out came another object. It landed on its feet as well. "I'm here, bro," it said.

It was Tails. He was a human too. He had peach skin as well, and orange-yellow hair with specks of white on the tips. He was wearing a canary yellow jacket with his logo on the back over a white shirt, carob brown pants and his same bright red and white striped shoes. He also had brunette engineer goggles in his hair, his same white gloves and sky blue eyes, and his cannon on his right hand.

When Fluttershy saw the way Tails looked, a blush slowly began to form on her cheeks, "Oh, my, he's so cute like a fox," she thought.

"Everyone, this is my little brother, Tails the Fox," Sonic introduced.

All the bands greeted "hi" to Tails. Tails walked over to the Rainbooms. "Hello."

"Hello, Tails," the Rainbooms said.

"So you're that two-tailed fox we saw at the Fall Formal?" Fluttershy asked.

"Yep, that's me," Tails answered as he put away his cannon, "And they're very useful, 'cause I can use them to fly."

"Oh my, this is amazing," Fluttershy said blushing.

"Uh, yeah, it is…" Tails said blushing as well while scratching the back of his head and then thought, "Strange, why do I feel connected to this girl? Just like I was when I met Cosmo?"

Then the vortex came back again. Now out came what Sonic assumed to be Knuckles. It was Knuckles and he turned to a human too. He had parmesean tan skin, his same violet purple eyes, and currant red hair that went down to his shoulders. He was wearing a brick red vest with a yellow/gold zipper over a garnet red T-shirt with a small white crescent on it, white fingerless gloves with his spikes on his hands, navy blue jeans, and his same red and orange shoes. His muscles on his arms looked really strong.

"Whoa, who in tarnation is that?" Applejack asked in her head as she began to blush, "He looks very strong and mighty good looking."

"This is Knuckles the Echidna," Sonic said.

"Hi," Knuckles said as he came to the group.

"You're that red echidna?" Applejack asked first.

"Correct, and the last of my kind," Knuckles said.

"Hey, what's with the spikes on your hands?" Applejack asked pointing at Knuckles' spiked hands.

"Oh, these? I dunno, I was just born with them," Knuckles said as he lifted one of his gloves off revealing his spiked hand.

The Rainbooms stared at Knuckles' hand with awe. "Well, I'll be. That's crazy," Applejack said.

"Yeah, I know," Knuckles agreed, then he started to blush and thought, "What the… this felling…"

Then for the fourth time, the white vortex opened again. This time, it was Silver as a human as well. He had peach skin like Sonic and Tails, his hairstyle was very similar to his hedgehog quills; five points to the top pointing up in the front and two long locks going down to his back while a few shorter points were in front of his forehead, and he still had his bright gold yellow eyes. He was wearing a dark green sweatshirt with white fur lining around his neck and cyan blue streaks on each side of the body over a white shirt, cloud grey pants and his same boots with the rings and cyan streaks. He also had white fingerless gloves on his hands, but they had the same symbols and rings as his original gloves.

Rarity blushed at Silver, "Oh, my, he looks really handsome," she thought.

"This is Silver the Hedgehog," Sonic said, "And he's from the future of my world."

"He's from the future?!" Twilight immediately exclaimed.

"Um, yes, about 200 years to be precise," Silver said.

"It's really nice to meet you, darling. My name is Rarity," Rarity said as she looked over Silver's clothing, "And I must say, your clothing is really fabulous."

"Um, thanks…" Silver said.

"Even your hair style… it's so divine," Rarity said as she stroked Silver's hair and blushed red.

Feeling Rarity's touch in his hair made Silver blush deeply. He suddenly felt butterflies in his stomach, "What is this feeling? I haven't felt anything like this ever since I met Blaze," he thought.

Rarity was feeling the same thing Silver was feeling, "Why do I feel this way? Must I have a crush on him or something?" she thought blushing deeply.

Now again, the white vortex opened and out came Shadow. He was a human too. He had peach skin like Sonic, Silver, and Tails, he had his same crimson red eyes, and his hair was black with red highlights. He was wearing a midnight black jacket over a metal black T-shirt, a silver dog tag with his symbol on it, pitch black jeans with a scarlet red and white spiked kneepad on his left leg, and his same crimson red, white and black hover shoes with the rings. He also still had his gold inhibiter rings on his wrists, now had ink black fingerless gloves and what looked like a coal black belt with a pistol holster on the right side.

Now it was Sunset's turn to have a small blush form on her cheeks, "He's cute," she thought.

"This is Shadow the Hedgehog," Sonic said.

"Greetings," Shadow said.

"Nice to meet you," Twilight said.

"Hey! What's with the frown?" Pinkie asked.

Shadow didn't want to act violent around the students, so he crossed his arms and said, "I guess I have no idea."

"Hmm, maybe you need… to smile!" Pinkie suggested.

Shadow then knew she was trying to make him feel happy. "Well, here you go," he said as he smiled.

"Perfect!" Pinkie said.

Then Shadow noticed Sunset Shimmer and thought, "Who is that? Well, I have to admit, she does look pretty cute."

And yet again, the white vortex opened. "All right, last one," Tails said.

After the vortex closed, Manic was the last one to come, and just like the others, he too was a human. He had peach skin like his brother, Tails, Silver, and Shadow. He had parakeet green hair that looked the same as his quills that were in the look of a rock style. He still had his sapphire blue eyes, and a black earing in each ear. He was wearing an unzipped garnet red vest over a white T-shirt, shamrock green pants with ebony black streaks on the side of the legs, a hickory brown belt that had a pocket for his drum sticks, and his same crimson red and white shoes. He also had his drum medallion around his neck, and white fingerless gloves with the same black and sliver spiky bracelets.

This time, it was Pinkie's turn to blush, "Holy moly," she thought as she looked in Manic's eyes.

"And this is my other brother, Manic the Hedgehog," Sonic said.

"Sup, people?" Manic said with a wave of his hand.

All the students were surprised Sonic wasn't alone this time. One by one, each student came over to the Mobians and asked each of them none-stop questions. The Dazzlings just stood where they were very confused.

"I don't understand," Sonata said, "What is so special about all those strange boys? Especially that blue spiky haired boy?"

"My only guess is that they met him before," Adagio said.

Out somewhere in the city, in the middle of an ally area, things were quiet. No one was around. Then something began to happen. Then a part of the ground near a dumpster began to slowly crack apart, and it made a hole. Soon a mysterious red mist had slowly risen out of it and began to appear in the form of a body.

As the mysterious red energy formed itself, it said in a scary demonic voice, "Twelve years. Twelve years I have been trapped in the ground, in that blackness. I couldn't see anything, I couldn't feel anything, but I could still hate someone who I had hated since the beginning."

The energy began to stand on legs as it continued, "Oh, but finally, I am free. And I can finally have my revenge. I will make you pay for everything that you have done to me… Sonic the Hedgehog."