Well, ever since "Big Hero 6" came out and became a big hit, I waited for someone to write a crossover between this movie and "Sonic the Hedgehog" because it seemed like a good idea; and because with me, everything ends with "Sonic the Hedgehog". After I waited for some time and no such crossover has graced this site, I have decided that I shall be the one to make it happen! And so, here is my "Big Hero 6" and "Sonic the Hedgehog" crossover!

Okay, so this story is a bit connect to a crossover saga I wrote on this site. You don't need to read any of its stories to understand this one, but there are some winks to it, like the entire way this crossover is even possible. Just a heads up.

This chapter will focus only on Sonic's side while chapter 2 will focus on the Big Hero 6's side. Enjoy!

A regular day in Central City can be usually described as full of events for the residents. The city was crowded as usual by the people heading from one place to the next with much hurry, as if they were trying to avoid something. The blue clear sky were filled with many possibilities, as the number of options they had to choose their fate. And of course, there was the boiling sun shining its rays over the city, like the heat of the battle that took place in it right now.

The people ran around the streets as they were avoiding an army of varied robots. From ones that resembled bees and other insects to more menacing looking ones with guns for arms and incredible strength, each robot was causing destruction and havoc around the city as they were ordered.

Looking at the events from his floating transport, was a baled middle-aged man who wore a red jacket with four white stripes on it, each colliding with a golden square, and black leather pants and boots. Also noticeable about the man was his large pink nose, and the long brown mustache attached to it. The man laughed as he witnessed the terror his creations were causing to the town, thinking he has won some kind of a battle.

However, much to his displeasure, three rays suddenly appeared and seemed to take care of each of the robots without breaking much of a sweat. Rays of light, to be more exact, took care of the robots which were destroying the city. One was blue, the second was orange, and the third was red.

The blue ray went straight through the robots at a super-sonic speed, causing them to break and not function. The orange light cut through the air, dropping bombs on the robots which caused the metallic creations to explode. The red one took down its share of robots from the ground, digging under them and surprising them with upper-cuts.

Eventually, the red ray went above ground before the slim form of a red echidna with a white stripe on its chest took its place in the streets, punching his massive gloved fists against each other. The orange ray vanished quickly after, and the echidna was joined by a young orange fox with two large tails that spun around, keeping the fox in the air, before they were slowed down and the fox landed on the road. He also had a high amount of white fur.

Then, out of the sky, the blue ray landed in front of the echidna and fox. When it disappeared, a hunched spikey creature holding his gloved hand against the road appeared. As it slowly got up, it was starting to resemble a blue hedgehog with peach colored arms and belly.

The panicked screams and cries for help turned into a loud round of applause targeted towards the famous trio that took care of the threat, as they were known as heroes among the general public. There was no mistaking them; these three were Knuckles the Echidna, Miles Prower, better known as Tails, and in the lead was non-other than the world's famous hero, Sonic the Hedgehog.

"Is this it, Eggman?" Sonic called for the man in the flying invention. "You've been gone for months, and this is your big comeback? I expected more." The hedgehog crossed his arms while teasingly rolling his eyes, clearly not impressed by the attack.

Usually, Eggman would have been more annoyed with his arch-nemesis's remarks. But this time, he wasn't growling or even that angry. Infect, he seemed to have expected this defeat to come. "Oh, but Sonic… You know me better than that." He said. "My plan is just beginning. For you see, I used the fact that Knuckles will be too busy helping you fight off those robots," The doctor said while gesturing to all the broken robots that filled the streets. "To send in Orbot and Cubot to steal the Chaos Emeralds from your home, and the knuckle-head's Master Emerald!" A laugh full of evil joy came out of Eggman's mouth following his announcement.

Sonic's confident smirk suddenly turned into a slightly concerned look while Knuckles got angrier with the evil genius for both stealing his emerald, and for the nickname.

"And what makes you think we can't get them back?" Tails was the one to ask.

The sound of a communicator ringing stopped the conversation before Eggman clicked on one button on the vehicle's control panel. "How's it coming?"

"Everything is in place, boss." A robotic voice said from the other side of the line. "The Egg-Jumper is ready for being used."

"Splendid!" Eggman declared before waving at Sonic and his friends. "If you still think you can stop me, I'll be waiting in my lab. See you!" The doctor declared just as he pressed a different button on the control panel, causing large engines to come out of the transport's sides and causing Eggman to rocket away with incredible speed towards his base.

"He sure made some upgrades during his brake." Knuckles said bitterly, as if the sentence left a bad taste in his mouth.

"Let's make sure he won't make any more of them. Let's go, guys!" Sonic told his friends before he speeded away after Eggman. Tails followed by spinning his two tails, causing him to fly in the air and move in a speed that, while a bit slower, allowed him to catch up with the blue hedgehog. Knuckles followed his friends by running at a speed similar to Tails's.

Eggman has reached his fortress in record time and guided his Egg-Mobile through the many long halls, until he arrived at his lab. In front of him stood his two robots side-kicks; one was shaped like and orb and was colored in red and black, while the other was shaped like a cube and where the other robot was red, this one was yellow. Behind them, a portal floated in mid-air with various colors circling around inside of it.

"Orbot. Cubot. Status report!" Eggman ordered them.

"The portal is up and functional, Boss." Orbot informed him.

"We set the coordinates just like you told us." Cubot added before commenting on the mission. "That big green rock broke my circuits harder than my cosine, Bob. And he is a bulldozer!"

Eggman silently sighed and shook his head before he moved towards the portal. "Did you have any problems stealing the lum?" He asked his robots.

"No problems at all." Said Orbot; who was the one in charge of getting the Chaos Emeralds from Sonic and Tails's house along with the lum, which was the main key of what Eggman was trying to achieve.

"Good." Eggman said as he checked the console and the settings for everything. "It's time for us to meet the future of robotics, and the prototypes for my new robot army!" The doctor declared while approaching the portal, his smile getting bigger and bigger with each step.

"I don't think so!" Sonic's voice sounded right before the hedgehog came inside the room in a ball form and started bouncing around, damaging the machine creating the portal and causing it to go berserk. Once Tails and Knuckles arrived at the place as well, the red echidna lunched into action the second he noticed where the Master Emerald was being held. As Knuckles was taking his emerald back, Tails attempted to get the regular Chaos Emeralds. Once one emerald and the Master Emerald were removed from their place and Sonic caused enough damage to the console, the situation got worse.

Sonic stopped rolling once he felt the entire building rumbling and lightning strikes started to come out of the portal. In addition to that, the rest of the emeralds also seemed to vanish from their place once the rumbling started.

"Boss, energy levels are dropping." Orbot informed as he checked the status of the machine. "The portal will close down shortly."

"Then let's go through it before it does!" Eggman told his side-kicks just as he grabbed them and rushed into the portal.

Sonic, Tails and Knuckles watched as Eggman disappeared through the slowly closing portal. "Tails, any guesses on where he is going?" Sonic asked his friend.

"Judging by the console and the portal itself, I think he built a Universe Jumper like mine." Tails said.

"Didn't he already do that before?" Knuckles asked. "I remember him surprising us during one of our universe trips."

"It seems like he upgraded it." The fox theorized as he checked out the coordinates. "Hey Sonic, he is trying to reach a future time in one of the universes." Tails informed once he noticed that different bit of information. "Mine can only bring us to the past and present of each universe."

"Future or past; we have to stop him!" Sonic said while slamming his fist against his palm. "Get the Master Emerald and the regular one. We are going in!"

And with that announcement, the trio went inside the portal. What was waiting for them beyond it was unknown.

Yep. That's what that machine is called. A Universe Jumper. It sounded like a good name back when I thought it up.

What lays beyond that portal? You will see in the next chapter(Which should be up shortly after this one is). I'll give you a hint, it's a hybrid of an American city and a Japanese one.

See you guys next time! Hope you like what you read and leave a review if you've got something to say!