Over a thousand years ago Starswirl the Bearded wrote his last spell, an incantation that by his own admission was "broken and unfinished". Centuries later Twilight Sparkle derived from it the spell that allowed her to ascend and become an alicorn. But while she was able to reverse the effects of the spell on her friends, they weren't the only ones affected.

Co-written with River Road and Edited by The Weakest Link

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

This story is a sequel to Honey Pie II: The Wrath of Chrysalis

Sweetcake has come far in life. From a defeated drone, stranded alone in Canterlot, he's become the queen of a large and powerful changeling hive. And he's doing a surprisingly good job at it. He even has time left over from his royal duties to help Pinkie Pie with her parties. Unfortunately for Sweetcake, Pinkie, and the entire hive, his hive is not the only hive out there, and the others don't approve of allying with ponies. Caught between betraying his friends and the welfare of his subjects, any choice may spell disaster.

Cover art by AnticularPony. Cover text design by Jordanis.

This story is a sequel to The Face I'll Wear

Dear Small Pony Book,

Hello. My name is Thorax. I am a changeling formerly of the Badlands Hive, ruled by the terrible Queen Chrysalis. Nowadays, I am fortunate to call the Crystal Empire home, and their Royal Family my friends.

Since I'm rather new to living in pony society—without orders to infiltrate, of course—my new friends have been doing their very best to help me get acclimated to this strange, alien way of life. To this end, Princess Cadence has instructed me to tell you of my experiences so that we might use this as time to reflect together. However, I do find it strange. How am I to discuss my day to day interactions with a book? Especially one without a name? You can't not have a name, that would just be rude. So, I will just have to figure one out for you.

I'm not sure why Cadence is laughing at that, or why Shining Armor is groaning. This is a very serious issue.

These ponies are strange. But I don't think I'd have them any other way.

A little thing for me to fiddle with when I'm bored. Updates will likely be sporadic. Tagged as a prequel/sequel to The Face I'll Wear because it will explore some of the same themes and will show events before and after the story.

Preread by Timaeus.

A series of one-shots set in an alternate world where the Mane 6 are the Power Ponies. Follow the adventures of six superheroes and their dragon sidekick as they defend Maretropolis from dastardly evil-doers, including the Mane-iac, the Equalizer, the Phoenix, and the God of Chaos himself.

Cover art by fluttercord45

Origins: The head of a multibillion-bit company, an orphaned farm girl in the big city, an underappreciated archaeologist's assistant, an up-and-coming fashion designer searching for inspiration, a veterinarian taking anger management therapy, and a bored girl from a rock farm. A notorious act of evil will bring these unlikely allies together.

The Mane-Raising Joke: Dee Tangler takes her role as the owner of a multi-million-bit haircare product company way too far, resulting in a tragic accident at her shampoo factory that will change her life, as well as the Power Ponies', forever.

The Shadow King: A scientist strives to help a pony he loves with his research in shadow magic. Meanwhile, Fili-Second and Zapp question their worth as heroes.

The Sirens' Song: When three beautiful, singing mares become an overnight sensation, the Power Ponies team is divided, and it's up to those unimpressed with the singers' talent to save Maretropolis from their evil scheme.

Heart of Stone: Saddle Rager is experiencing strange dreams involving the statue of Discord at the Maretropolis Museum. Meanwhile, Zapp has noticed the statue has been cracking, and it gets worse and worse every single day...

Don't Cry After Sunset: Some pony from Twilight's past re-emerges, at the same time mysterious robberies are occurring by a master thief who leaves no evidence behind.

Longhorn's Journey Into Night: At long last, Mistress Mare-velous gets a lead in finding her parents' murderer and insists on pursuing him alone, but Humdrum won't allow it.

The Pharaoh's Curse: A new mummy arrives at the Maretropolis Museum of a said to be cursed pharaoh.

Should I Stay Or Should I Go?: Parallel chapter to "The Pharaoh's Curse," in which we see what Twilight and Applejack are up to while on vacation.

Starlight Glimmer is planning her revenge. She wants to wipe away the ones who took everything from her. Who destroyed her dreams. So she's decided to trail them and learn their secrets, especially that meddling alicorn's. The key to it all is that they don't know about it.

Unfortunately, one stallion knows and Starlight's going to have to play nice in order to keep him quiet.

Everyone knows that making friends is hard. Keeping them long enough to defeat several evil villains bent on world domination, and a few ponies who are just jerks, with nothing but the sheer power of friendship and good feelings is even harder.

Wouldn't everything be easier if you just had a gun?

Let's find out.

Coverart and the concept as a whole is from that guy named tjpones, go look at his stuff.

The people of Equestria and Gaia may have a lot in common with each other, but when one world is populated by ponies that possess the gift of magic while the other has bipedal creatures that don’t, there are bound to be some differences.

They will have different traditions, different values, different beliefs, and different celebrations.

Of course, harmony and friendship is all about embracing the things that make people unique, and if there is going to be harmony between these two very different worlds, it is important for everyone to understand these differences.

Fortunately, there are a couple of girls who are very eager to learn.

A collection of short stories that take place in the same setting as my Harmony and Valor series, but are not part of its official canon.

Edited by GirlOfManyFandoms.

Once a month, there's this mare that comes to the park. She's absolutely beautiful, and I can't help but to watch her.

I've long lost the source for the cover art.

Edited by Magistrix.

Sunset always knew that she was destined for greatness, but she never dreamed of how great she could become. Not until she had seen it – the mirror had shown her as an alicorn. Ignoring Celestia’s warnings, Sunset goes looking for answers.

When she learns that the mirror is also a portal to another world, well, what else was she supposed to do? But it seems that she hadn’t considered every possibility. She hadn’t, for example, considered that she might get herself trapped on the other side. Nor did she think she’d find herself transformed into a child again.

(Also available in print (temporarily out of stock), as an audiobook, and in Russian!)

A story set in the Who We Become series (earliest story, so a great starting point )

Many muches of thanks go out to ArchAngelsWings, Dessert, Mind Jack, Pasu-Chan,
CharCharChan, w_brown7, and eton975 for proofreading.
Additionally, thanks to Pasu-Chan for providing the glorious cover art