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 "what-if" sequel of Equinophobia. Prior reading of the linked story is recommended.

Equinophobia was the psychological fear of horses. Now it's gone along with the remnants of her person.

In her desperate and broken state of mind, Ryan had made the faux offer of being integrated into Equestrian society. She never realized the sun goddess would agree with her.

Memories stripped and replaced as she's morphed into a new form, the woman formerly known as Ryan becomes the mare known as Silverbolt.

However, not all the remains of her past can be so easily erased.

Ryan's "offer" takes place in the beginning of chapter twenty-one of the original story in case you don't recall.

Alternate universe tag for changes to Equestria Girls elements and the Crystal Empire's history.

Rarity is well known for her melodramatics, but it turns out she's been performing a part longer than any of her pony friends ever imagined. See how this human-turned-filly became the mare she is today. Watch as she takes her final bows on the closing night of her role as unicorn seamstress.

Tagged AU just to be safe.

Following his tumultuous defeat, King Sombra is flung across space and time to exit out a human's malfunctioning toaster. For weeks, Sombra monologues his revenge to destroy those that hurt him. But seven months later, when a route back to Equestria is found, does he not seem all that interested in returning.

Edited by spigo.

Prequel: The Roommate From Tartarus
Side Sequel: (Not My) Home Sweet Home

Update: labelled as complete. The last three chapters will remain as bonus chapters.

For Rarity, waking up with split ends is the absolute worst thing ever. Unfortunately, a mysterious stallion proves otherwise when he warns her that Armageddon is approaching and Equestria is doomed, and if that happens, she can kiss her well-coiffed mane farewell. Now the timeline is splitting worse than Rarity's hair as our intrepid heroine travels back again...

and again...

and again in order to save the world, with perhaps a smidgen of help from Princess Luna. And if she happens to find the time for a trip to the spa along the way, well... A mare can't be blamed for wanting to look her best, can she?

Thanks as always to JeffCvt for editing.

Further thanks to Prak for prereading!

Fantastic cover art provided courtesy of Pony-Berserker. Check out his other work—it's all amazing.

In the aftermath of the Changeling incursion of Canterlot during the marriage of Shining Armour and Princess Mi Amore Cadenza, Equestria gears itself for war against the Changeling menace. Against a foe that can take the shape of anypony, assume their life, and undermine Equestria from within, the Royal Pony Sisters create a new institution to monitor their Royal Guard for any Changeling corruption, cowardice, and incompetence: the Commissariat. As total war rages across the land one hero stands out above the rest; Commissar Blueblood, Hero of Equestria. Or at least that's what the propaganda says. The truth, as ever, is far more complex, as the esteemed Blueblood is merely looking for an easy and sedate life. Unfortunately, fate has a habit of throwing him into increasingly dangerous and suicidal missions, which he must survive with a combination of self-preservation, lying, and sheer blind luck, even if doing so only fuels his soaring reputation!

Equine military fiction in the style of Ciaphas Cain and Flashman.

Cover art done by me.

Proofread and edited by the always dependable Setokaiva.

A pariah who has long lived in their elder sibling's shadow, only to try and violently assert their own greatness and fail...both Loki and Luna know this tale all too well.
After the events of Thor, Loki Odinson of Asgard has fallen from grace, only to find himself in an unknown realm. Reaching out to him is Princess Luna, whom finds the similarities between them. Will Loki accept her help and recover from his dismay, or will he end up spurning it because of his arrogance?

More info below the break.

Arc 1: Entering Equestria 1-13
Arc 2: The Avengers 14-23
Arc 3: The Great and Powerful Student 24-33
Arc 4: Delving into Hel Itself 34-46
Mini Arc 1: Lorelei the Temptress 47-48
Mini Arc 2: The Equestria Games 49-50
Arc 5: Thor The Dark World 51-57
Arc 6: Calm Before the Storm 58-70
Arc 7: The Performance of a Lifetime, the Fall of Thanos 71-75
Arc 8: To Remember When One Should Forget 76-80, Epilogue
Bonus Chapters

Cover image from CuteSkitty on Deviantart: http://fav.me/d5whxcz

Crossover with The Avengers

9.12.2014- Cripes, I made the featured box?! Thank you all so much!

After his actions in New York, Odin hands down his sentence for Loki's crimes. Instead of execution or being locked in the Asgardian dungeon for the rest of his natural life, Loki will instead be sent to live with his granddaughters, to learn the virtues he is so desperately lacking.

Loki didn't know he had granddaughters. He had even forgotten he had a son in the first place.

And to make things even more complicated, said granddaughters are magical pony princesses in a magical land of talking, technicolor ponies called Equestria.

Yeah. Things are gonna get interesting.

Idol Hooves holds a special place in Equestria. He's probably the only exiled changeling to serve in the Royal Guard, or at least, that's what he expects, as exiles don't really broadcast that fact. However, it's well known that Princess Celestia loves all of her little ponies, and her guards perhaps more so, and that makes it one of the best ways for a changeling to discreetly feed.

But how does a changeling even get there, let alone get exiled in the first place? For that matter, why would it ever go to Canterlot? Set a number of years before the series proper, before Luna’s redemption, Idol details how he was exiled, the ponies he’s met, and the series of misadventures that led him to joining the Royal Guard, and should continue a good ways into the series, as something of an alternate perspective.

Soon, he’ll have to deal with a boisterous new princess to serve and a royal wedding in the works bringing a third to power. Will his old instincts bring this new life crashing down around him? What precipitates Chrysalis’s ill-fated assault on Canterlot? Is it really so wrong for a changeling to enjoy good craftsmanship to an obsessive degree?

New cover art provided by the fantastic Carnifex

And a TVTropes page here.

And an Ask Blog of questionable canonity!
Out of Idol Curiosity

Fanart by Norad2! Major thanks! Short For a Royal Guard

Art by Egophiliac of Idol and his Daring Duckie Please don't tell him what that brush is meant for.

Rating updated to (T), it's a bit darker than (E)
Comedy Tag added as well
And changed the character tags a bit.

Takes place in an alternate universe where Celestia and Luna used the Elements of Harmony to slay King Sombra.

Celestia and Luna are no more. The sun and moon have collided, and the heavens torn asunder in the aftermath of their final battle. The Elements of Harmony are missing, presumed forever lost. The fiends of Tartarus are on a rampage, and no one can stop them. And to make things perfect, the ruler of the nation of Boardor has decided to invade.
Desperate, Clover the Clever's last living student gathers together 108 virgin mares, in order to perform a ritual that will revive King Sombra. They succeed... kinda.
A human, in King Sombra's body, suddenly finds himself in an Equestria in a downward spiral with a bunch of technicolor ponies begging him to save them. Convinced that he's either dreaming, stoned, or insane, he tries to go along with it as best he can, although the voice in his head, a very angry voice with a hunger for conquest, crystals, slavery, and stairs, isn't doing much to instill confidence in his own sanity...

New Cover Art By Shadow Bolt!