When Discord is left on his own for an entire week in Equestria, he ends up finding about the alternate human world and decides to pay it a visit. There, he meets Sunset Shimmer, the Rainbooms and of course, Sonic and his friends. Discord decides to have some 'fun' with these new faces and introduces a whole new meaning to the word 'Chaos.' After everything they've been through, can Sonic and the others withstand Discord's chaos?

Sonic, Shadow, and Silver have been sent to the world of Canterlot High along with the seven Chaos Emeralds by the Master Emerald after hearing of a prophecy about the fate of worlds. They will have to go through school again if they are to regain the seven Chaos Emeralds and saved the worlds from the eternal darkness, for the emeralds have been claimed by some of the students of Canterlot High.

Sonic had never really been able to let go of his past and as such kept it hidden from his friends, this has now come back to destroy his trust with them and when Sonic is whisked away to another world, alongside some 'special help' he is able to let go of his past for a while... but the demons and evils that this world holds with his new friends in this world prove that no that matter where he goes, secrets create problems and with his new friends who want to teach him the magic of friendship that sentiment is made all too true by their past as well.

One night, Princess Celestia was gazing at the moon, remembering the incident that happened less that a thousand years ago when a bright blue light suddenly appears before her. Once the light dies down, a small blue creature and seven mysterious gems that have an incredible amount of power remained. Seeing how young the creature is, she decides to care for it for a while only to see it as one of her own. After seeing how fast it could move she decides to name him Sonic.

Please note this is my very first story so please hold back on the hate.

After an altercation with an old enemy, two heroes from a very different place are sent from the battlefield to a new world known as Equestria. The Mane 6 discover them and take it upon themselves to treat the two-tailed fox and his flower girlfriend as anypony else, befriend and help them in any way possible. As trouble brews back home and another pony is discovered away from home, the two visitors learn from Twilight and her friends about this new world, and see how the magic of friendship is a thriving force and spiritual bond among pony kind, opening Tails's mind to the possibilities of accomplishment, and Cosmo's heart to a stronger hope of universal peace.

NOTE: This story is inspired by both MLP: FIM, and Tails and Cosmo of Sonic X, a property I do not claim as my own.

This story is a sequel to Sonic: Chaos in Equestria

It's been a month since the events of the last arc and things seem to have become peaceful once more. However, something looms in the shadows that threatens the very existence that Equestria's heroes call home.

As foreign relations with the neighboring territories become strained. A great army slowly gains strength.

Joined by the Sol Zones Guardian and Ruler; Blaze the Cat. Sonic and the Mane 6 are about to embark on a journey that may put their power and friendship to the ultimate test.

As a result of trying to stop a Super Genesis Wave through the usage of Chaos Control by Super Sonic near the world of where the Rainbooms unleashed their magic to stop the Dazzlings, causes the two worlds to come together. It ends up with Sonic, Shadow, Manic and others are now at Canterlot High along with the Rainbooms. But with Sonic there, things aren't ever going to be normal and 'chaotic' things tend to happen.

Dr. Eggman has finally done it. He's finally beaten Sonic and taken over most of the world, aided by a mysterious figure known as Infinite. However, a resistance consisting of Sonic's friends from around and CHS has been formed and Sonic's not down for the count just yet. Now, they have to fight to take back the planet , but with Eggman's army having enemies new and old, it won't be easy. Sonic, The Equestria Girls and their friends are in for their biggest challenge yet.

2021 Update. New Sonic writing project.
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Sonic has nothing to do, Doctor Eggman is in jail, everything is like yesterday, heck, the canyons he trains at are nothing new! Well, good thing a hole in space-time sweeps Sonic into a new adventure in a pony land!
Unlock friends, foes, vehicles, and items!
See here for characters.
See here for gear.
Meet the Mane Six!
Meet Sonic the Hedgehog... twice! And help him rescued himself!
Meet Sonic's friends and rivals! ... and siblings?!
Discover secret factions Sonic will probably not learn about!
Discover secret groups Amy will find!
And who is the villain behind Time Eater?

Explore Equestria to save it from being erased and colorless with the help of the Elements of Harmony ponies.

Explore Canterlot High as you try to stop three teenage girls from ruling the world with the power of music! Why does that sound familiar?

This story has canon and past canon characters. i.e. Sonic's siblings from Sonic Underground.
All OCs are slightly altered versions of regular characters and are altered for plot convenience... or just because of Shadow.

WARNING: VILLAINS MIGHT NOT BE KID FRIENDLY. THAT IS WHY "TEEN" IS ON THERE.
I am not consistent in these things above.
There's also secret chapters you can access with the code: Shard the Metal Sonic.

This story is a sequel to The Blue Blur

Dr. Eggman finally won. Sonic the Hedgehog was defeated and is presumed dead. And as a result, the Eggman Empire could now expand on a global scale.

In his absence, Sonic's friends banded together as a Resistance to fight back against the Eggman Empire. But the appearance of six ponies from another surprises them, claiming to know Sonic and decide to help. With the aid of the Equestrians and the newly recruited Rookie they find hope once more.

Meanwhile, Tails crosses paths with another Sonic that he's met before and a certain dragon. Together, the three of them set off to fight Eggman alone.

Sonic, the Rookie, their Equestrian allies, and all of Sonic's friends must join forces if they want to liberate the world from Eggman. Fighting old foes and taking the world back bit by bit while also dealing with the new entity known as Infinite.

Has a TV Tropes page now.