What are the chances your favorite pony was secretly a changeling all along?

Yeah, probably about one in one.

On a dark night filled with even darker magics, an insane cult attempts to give Nightmare Moon a body and life of her own, utterly separate from Princess Luna. But, when the spell is interrupted by Celestia, something unexpected is created.

Now, a little black alicorn filly named Nyx finds herself living under the care of Twilight Sparkle, only to be haunted by memories and emotions from her past. Is she Nightmare Moon reborn or is she simply a doppelganger with a soul and mind of her own? Can Twilight Sparkle protect Nyx from those who refuse to see past her dragon eyes and black coat?

Or, will Nyx be forced to inherit the sins that may not even be hers and become the greatest evil Equestria has ever known?

The Eleventh Doctor (aka Matt Smith) is bumbling about in his Tardis when a crazy timey-wimey happening finds him in Equestria, a land from a children's cartoon. Despite the idea that being in the world of TV ought to be impossible, he's found himself turned into a bowtie-wearing pony in a pleasant little town known as Ponyville. What's more, the people there won't stop calling him Doctor Whooves! In order to get bet back into his own Time Lord form and out of the impossible world of My Little Pony, he may or may not have to make some new friends, fight some villains and pull out his "savior of the universe act." Geronimo!

This is a different take on Doctor Whooves, and also a sleep-deprived Doctor Who/MLP crossover idea I got in the very early hours of the morning so it could easily be rubbish. It's not meant to be terribly serious, but it's also my first fic so go easy on me. More characters could come and the rating could possibly change.

The Doctor has had a good, long run through time and space with Ditzy Doo. But it is that time again for him to regenerate bodies. But this time, it seems... different...
What would happen if The Doctor regenerated... as a mare?

Princess Peach Toadstool of the Mushroom Kingdom has come to Equestria on important diplomatic business, bringing with her the superstars of the Mushroom Kingdom, Mario and Luigi. But, when Discord is released, and aids Bowser's forces in invading Equestria and kidnapping Peach, Celestia, and Luna, Twilight and her friends must work together with Mario and Luigi on an adventure spanning two kingdoms, to rescue the princesses, defeat Bowser and Discord, and return Equestria and the Mushroom Kingdom to their former glory.

Luna takes a personal day at the request of her sister and Twilight Sparkle, but whilst visiting they each find something hidden in their hearts they didn't know was there....

Note: The rewriting has started!
Magnus is the sole survivor of a colony ship headed towards Betelgeuse. The ship gets thrown off course when a huge asteroid slams into the ship, which is then pulled into a black hole.

When the ship exits on the other side, he finds himself alone and in an unfamiliar shape. His only companion, an advanced A.I named Ana keeps him slightly sane during their six thousand year voyage through unknown space in a nearly derelict ship.

Everything changes when they find a small blue planet teeming with life.

The old version can be found here: Link

Editing by: Lab
All art by: Mister Aibo, DeviantArt, Fimfiction Profile

There really is no excuse for forgetting something as important as a hoof-written law. But Celestia forgot. And now, a thousand years after she wrote it, a law comes into play mandating that Celestia take a two-month sabbatical from her duties as Princess of Equestria.

So what happens when she has to step down for a couple months and leave Luna by herself in the bloody gladiator ring that is Equestrian politics? What happens when Celestia has to disguise herself and mingle with the populace of Ponyville without them knowing?

The short answer to that would be "a string of hilarious chance encounters, sisterly banter, romantic mishaps, and a political coup that was decades in the making."

The long answer, of course, is this story.

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Rated Teen for swearing and sexual humor.

Cover image is by enma-darei

A freak accident causes New York Police Detective Kate Beckett and her partner, best selling mystery writer Richard Castle, to be turned into ponies and transported to Ponyville. Meeting up with Twilight and her friends, Beckett and Castle try to deal with their new bodies, the citizens of Ponyville and all the insanity that the Mane 6 seem to attract, all while trying to find a way home.

TVtrope page found HERE

Princess Cadance noticed how lonely Princess Celestia seemed on Hearts and Hooves Day.

She decided to send a small love spell her way, as motivation to help her find a special somepony, even if it's just for a day.

Cadance immediately regretted it upon finding out who it was.

Special thanks to Mickeymonster for allowing me to use the cover image!

Edit: Mickeymonster has made a colored version of the cover image! Original image: http://fav.me/d4mozkh