This story takes place during the Season Five finale, "The Cutie Re-Mark". As such, there are spoilers ahead.

Starlight Glimmer's plan is working. All she has to do is upset Rainbow Dash's rainboom-creating race in the past, and Twilight Sparkle's connection with her friends will be severed. And she's done it. Repeatedly. Sure, Twilight can go back in time to try and stop her, but Starlight will always be brought back as well. No matter what Twilight tries, no matter how many times she returns, she can't stop Starlight. They're evenly-matched, and it's much easier to disrupt events than it is to preserve them.

That means Starlight wins, right?

Jason's life has grown dull. While some may have thought that the weekly monster attacks might have kept him on his toes, he had grown to learn that as the norm around town. Now, after months of living in Ponyville, he can't shake the feeling that there is a void in his life. He follows his usual routine every day: breakfast, a quick shower, followed by a quick walk to the park to read the newspaper. One morning, he finds two parents playing with their filly in the playground. As he watches, an idea sparks within his mind: why not adopt a pony of his own?

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They say that I must send my sister to the moon for one thousand years. They say that she is too far gone, and that it is for the best. But I cannot believe that. I refuse to believe it! Luna is my sister after all, and I can still save her!

But then a small part of me asks, What if I really can't save her by myself? What if... what if they're right?

Inspired greatly by the Luteces' cameo in Trade Ya! You do not need to have played BioShock Infinite to read and understand this story.

Also, many thanks to Alicorn Airport, Kirito-Persona and Protopony350 for being my pre-readers. Many, many thanks as well to Haycart for being my wonderful editor.

And many thanks to Will-Owl-the-Wisp for the amazing cover art. You can find the original here.

Now with a story reading by myself, Wisp, and MelancholyIguana.

Warning: Some spoilers to the end of BioShock Infinite in the comments.

WARNING: If you did not play the game Undertale (both endings), you will be VERY confused.

Frisk made many mistakes for doing the genocide route in her timeline. But as if by miracle, she was sent to another world before making the worst choice ever. Will she be able to learn from her mistakes and start a new with a happier end?

Monsters. Mythical Beasts. Legendary Creatures. To humans, they're nothing more than stories. To the students at Canterlot High, their existence is a bit more believable. To Sunset Shimmer, the myths and folklore she reads about in English class could've been an everyday occurrence. In Equestria at least. That is, until she heard a story about a certain mountain.

Pinkie took a hop, skip and a fall straight into the underworld that exists in another dimension entirely.

Now her mane seems permanently popped, her heart keeps ejecting itself from her body, her cutie mark is missing and she's being constantly beset by strange monsters.

Pinkie fell to these monsters, now she has to dance with her heart to save them and herself.

This is an "Undertale" crossover.

In the depths of Mt. Ebott, a voice through Space-Time echoed softly through the cavern, and in its center where daylight shone through, lay a flower patch where a young soulless monster sat glumly. Suddenly the monster is thrown into a world where peace and Harmony reign.

Toriel, a friendly monster who helped out a human. She wanted Frisk to stay, but the human said that she wanted to go home. Toriel was saddened when the human left the ruins to head back to the surface. When she went back home, she found a strange artifact that wasn't hers. She finds a note saying "Do you want to go to the surface?" Toriel touched the artifact and is transported to a new world and in a new body. Will she be happy that she is on the surface and is seeing the sun, or will she want to go back?

After so long, the barrier preventing the monsters of the underground from feeling the sunlight on their skin (or fur, scales, bones, etc.) has shattered. Everyone is exploding with anticipation to see the horizon from the top of Mt. Ebott, to feel the clean fresh air, and to experience the wonders of the surface. Giddy excitement turns to confused shock when everyone finds them self not atop a mountain overlooking the sunrise, but in a dark forest with an air of fear in the mist at their feet.

The lives of the residents of Ponyville get a little more interesting when seven visitors unlike anything Equestria has ever seen appear out of the Everfree forest. While they are intimidating at first (especially a certain blue one), they are quite friendly once you get to know them. There are only a few problems, they have nowhere to stay, and many more of their kind are coming.

Crossover between Undertale by Toby Fox and MLP:FiM. Set at the times of the True Pacifist ending and before the Season 4 finale respectively. Moderate spoilers for Undertale.

Long ago, two races ruled over Earth: MONSTERS and PONIES
One day, war broke out between the two races.
After a long battle, the ponies were victorious.
They sealed the monsters underground with a magic spell.
Many years later...
Legends say that those who climb the mountain never return.

This is an Undertale X MLP:FiM mash-up, but it will still have potential spoilers to the game. If you haven't played it yet, then turn away now. Also, in keeping with the game, the main character is you, the reader.