It was supposed to be an easy delve. In, explore, and out.

Instead Daring Do finds herself wandering through an endless corridor, wishing for nothing more than to see the sky once more. And when she reaches the end of the maze, she discovers something waiting for her that hasn't felt the sun for a long, long time. Something very lonely.

And hungry.

Okay, I don't know if anyone can hear this, or read this, or whatever, but I'm trying my best to use Pinkie Pie's legendary fourth-wall-breaking powers to try and get a message out.

If you can hear this, I need help. I'm in Equestria, and man, this is strange. But I'm also stuck in Pinkie Pie's body, for some reason.

Yes, it's just as weird as it sounds. And now, I need your help... because all the ponies in this town think I'm crazy!

Twilight Sparkle, Arcane Mage, knows that there is some truth to the story of Nightmare Moon, but her mentor, Princess Celestia, dismisses the matter in a heartbeat. She sends Twilight to the town of Magiville to oversee preparations for the Summer Sun Celebration, much to Twilight's distaste.
Unbeknownst to her, the darkness is gathering in Mystica. Assassins lurk in the shadows, Undead gather in the forest, werewolves sharpen their claws, and criminals and mercenaries prepare themselves.
To win the coming battle, Twilight will have to rely on her wits, her magic, and the five mages she's been saddled with. No matter how much they annoy her.
Rated teen for violence and language. Humanized, action-y. Based on the first two episodes, with some large changes made.

Stranded on a hostile, alien world, Twilight Sparkle and Rainbow Dash must depend on one another and a fellow alien castaway if they want to return home to Equestria.(originally published on FFN)

[Wrote this before DS3, ending is probably not canon, but I had to modify the canon to integrate ponies into the storyline]
It is 2508. The USM Valor is armed and authorized to "rescue" USG Ishimura from the grasp of the Marker. Numerous cases of dementia start to appear in the crew members of the Valor along the journey to the Aegis system, especially in the Marine veterans onboard who have survived the horrors of the Resource Wars and colonial insurrections.

Meanwhile, across the universe, the Royal Sisters of Equestria funded a project to seek other sentient beings in the universe that have been directed along a path of havoc and destruction by Discord. Pinkie Pie, one of the "early-detection" staff, is accidentally transported onto the USM Valor around the time the destroyer's crew begins to experience its final moments, as they find something extremely foreign in one of Ishimura's escape pods....

One of the military personnel that had been deemed a Section 8 onboard the Valor soon narrowly escapes his demise, and, skating on the thin ice of his already broken sanity, meets the aformentioned pink pony in the blood-drenched decks of the crippled Valor.

To join is to survive, and in pieces we scatter.

BTW, it's a non-Isaac Clarke perspective

Eighty years after the events of The Dread Chitin, Equestria is a radically different place. The arcane science of the late Duran Thirk and the information found on the Star League library core have combined to catapult the nation's science ahead by hundreds of years.

Now, facing the possible aggression of a completely unknown alien power, Twilight Sparkle and her friends have to gather together once more, leading a crew of the best ponies they could assemble in a voyage outside their own star system. They seek to learn about their potential foe, to explore the galaxy around them, and possibly find allies and friends to stand alongside them. Who knows what they will actually find?

Shawn Spencer, psychic detective, is a thick-tufted boy genius who ice skates through life on polished blades of snarky eloquence. He has tested himself against some of the greatest criminal minds of his time and emerged victorious... though often through unbelievable luck and not a small amount of bumbling.

Now, he faces a challenge unlike any before. One that will test his mind, his sanity, and his adaptability as he is thrust into the midst of an unfamiliar world and the ponies who populate it.

The Mane 6 face their own challenge, as an old enemy, tempered in the crimes of a much harsher world than theirs, returns to Equestria. It is a challenge they are ill-prepared for and one that only their strange, new, alien friend can help them overcome.

The city of Dock has long been a quiet shadow of its former self, and nopony knows that better than Belle, Captain of the town guard. A steady decline in the fortunes of the once prosperous port town has led to a certain amount of boredom, and to be honest, she wouldn't have it any other way.

When disaster strikes the otherwise sleepy town, Belle finds herself hock deep in the middle of a mystery unlike any the city has ever experienced. Now she must rely on her wits, and the help of friends both old and new to stop the pandemonium that threatens to destroy her world.

(Takes place between "It's About Time" and "A Canterlot Wedding.")

In the 31st Century, humankind has spread to thousands of planets in the Inner Sphere. Once united under the glorious banner of the Star League, the Successor States and their noble houses now fight bitter wars over the scraps of empire. When a JumpShip carrying a special task force from the Federated Suns suffers a catastrophic misjump, the occupants find themselves stranded above a strange, beautiful world at once alien and eerily familiar.

Meanwhile, in the peaceful realm of Equestria, Ponyville’s resident bookworm , Twilight Sparkle, has stumbled upon hints of a secret buried for centuries. A secret that may lay bare long-forgotten aspects of Pony history and culture.

Our story begins on the planet Valexa, where the beleaguered Militia has launched a last-ditch effort to call for help against overwhelming odds.

Written with those who are not familiar with the BattleTech/MechWarrior universe in mind.

Out on the frontier, the only friend a pony can really trust is the gun in her hoof. Out where the land is wild and the buffalo roam, more than a few ponies have foregone scratching out a living on the farms or mines to seek riches and glory on the wrong side of the law. As a particularly mysterious and valuable cargo heads west on a long train journey, six mares follow with trouble in their wake, each intending to claim the prize for her own.

Also, a lot of ponies get shot.

Edited by: Exuno
Preread by: barbeque
Inspired by the art of: Coin-Trip39
(Make sure you take a look at the cover image full-size! It's fantastic!)