It's chaos in Sonic's world as he and his friends (Tails, Knuckles, Shadow, and Silver), race to stop the nefarious Dr. Eggman, who has acquired all seven Chaos Emeralds. The doctor believes he has their mysterious powers mastered, until they overload and open a portal not too different from the one that sent Sonic and his friends to earth years ago. Only this time, they don't end up on earth. They're in a brand new world, one with solar deities, mysterious forests, majestic cities, and, most notably, friendly, adventurous, colorful ponies, which they just happen to now be. They're in Equestria.

But Dr. Eggman was sent to Equestria as well, and the race for the Chaos Emeralds is on. But the doctor isn't alone. It's up to the combined forces of Sonic's team and the Mane 6 to protect their world from perhaps the gravest threat yet.

(Note #2: This story takes place in the canon world of MLP as of episode 13 of season 5 and a somewhat freak Sonic universe comprised of the Sonic Adventure games (and a slew of other Sonic games that will be mentioned) and the Sonic X TV series.)

(Cover art by Red Thunder on Deviantart)

An accident in the lab sends our favorite boy genius to Equestria, as a pony. What will he do and how will he get back? The answer: Science! (Cover Art Updated!)
New FAQ! and TV Tropes!
Planned Phrases from Dexter:
“Pinkie Pie! Don’t push that Button!” /to Pinkie
“Please, Magic is the word simpletons and the ignorant use to describe what they cannot understand.”/ to Twilight
“No, I didn't strap a rocket to you. I strapped you to a rocket.” /to Rainbow Dash
“Friends? Who needs friends?”

Dexter is a boy super-genius with a disdain for anything girlish and no desire for friendship. After an mishap in his lab, he gets stuck in Equestria. How will he cope with the over-friendly ponies, and the girlish everything?
For any who do not know Dexter's Lab: http://en.wikipedia.org/wiki/Dexter's_Laboratory
[RIP Christine Cavanaugh: 8/16/63-12/22/2014] - Dexter's Original Voice Actress

When Dialga and Palkia start to attack one another in Alamos Town, a Ponyta named Flare Blitz is caught in the crossfire. After falling into the dimensional rift, he finds himself in a strange new land filled with brightly coloured ponies. Flare doesn't know how he got here or if he can even get back home...

The question is, will he even want to go home?

Edit: So I finally got offa mah flank and started the re-write. I want to give massive props to Blazinblade7 for editing as well as my little bro, who is teaching me a great deal of authory stuff.

You can find the TV Tropes page here!

Equestria was at war once more. After hundreds of years of peace, war has once more set its hooves on the country of harmony.

At the head of this all was Shining Armor, the Captain of the elite Royal Guard. However, despite his years of service, nothing in the peacetime service of the Guard could have prepared him for the life and death stakes of the war. Given the task of protecting Equestria, he must now navigate the battlefields on the north and the political intrigues of Canterlot as he and his comrades try to save their country from the ravages of war and the changes it brings with it.

This story is a sequel to Sombra in the Legion

The Legion of Doom led by Grogar have planned to conquer Equestria and destroy its protectors. However, without any warning, an old acquaintance of Grogar waylays him and his legion and sends them to a place they never thought they would see or encounter except for the ram. With an unusual turn of events and an odd alliance of ancient creatures occurring, the Legion must work together to fight this new threat and the newfound power that could end their existence.

General Grievous, Supreme Commander of the Separatist Droid Army, conqueror of star systems, and slayer of Jedi. And... stranded on Equestria?

This can't end well.

TV Tropes page.

Now featuring a dramatic reading by LimeyPony!