When an ancient Equestrian artifact suddenly tears a hole in time and space, Sunny Starscout gets the chance to meet her idol, Twilight Sparkle, for real! However, not only is Twilight shocked by the changes to the Equestria she loves, but Opaline's ever-present eyes see this as an opportunity to undo her defeat at Twilight's hooves. Twilight and Sunny must find a way to stop the mad alicorn if Equestria is to remain stable.

G4/G5 crossover.
Timeline: Pre-season 9 of FiM, post G5 holiday special.
My 40th pony fic!
Coverart by Adagiostring.

Long ago in a distant land, Ivo Robotnik, the egg-shaped master of science, unleashed an unspeakable evil. But a brave blue hedgehog wielding supersonic speed stepped forth to oppose him time and time again. Before their latest confrontation reached its climax, the villain tore open a portal through time and space, and flung him into another world where magic and fantasy are everyday reality. Now the hero seeks to return to his world, and stop the mad doctor from conquering this one too. Along the way he'll meet new friends, new enemies, and just maybe something a little more. All while the fate of two worlds hangs in the balance.

Hang on to your seats boys and girls, cause we're breaking down the walls between dimensions.

Now on TV Tropes.
Cover art by BroDogz.
Sonic the Hedgehog universe, set directly after Sonic Generations.
MLP universe, set just before the end of Season 2.

Edited by, Jet Storm, Typoglyphic, Bok, and RobKuro85.

After some inspiration from from my good pal Gunflame, I'm throwing my hat into the ring for a good Sonic/MLP crossover. And I aim to give it the much needed improvement in quality that's so desperately needed with this particular crossover genre. I'll strive to make this one of the premier Sonic/MLP crossover stories on the web.

Thank you and enjoy.

Featured: 3/3/22, 6/18/23, 6/26/23, 1/1/24, 1/27/24, 3/14/2024

After Planet Aether has been brought to peace and stabilized, Samus Aran doesn't get much rest when she's sent to reconnoiter a nameless planet on the edge of Galactic Federation space. Ostensibly, she was supposed to determine the size of a Space Pirate operation that was mining Phazon on this planet... and mark the place for a quick strike by Federation forces if it came down to it.

But when things become much more complicated beyond what her mission brief had stated, she may find that her fate and those of some unlikely allies may be intertwined. The battle that rages on the ground in a fight for survival and duty may have Samus questioning herself when a new front in an undeclared, nameless war is opened... in her mind.

-This is in no way related to Metroid Equis. No required reading, no relation, nothing. Pretend it does not exist.
-Takes place between Metroid Prime 2 and Metroid Prime 3. Metroid Timeline can be found here.
-Art by Pridark, sourced to her DA. Full picture is there.
-Story assumes very basic knowledge of Metroid universe, but I'll be doing my damndest to make this as accessible as possible.

He was an alien raised by humans, torn between two worlds and belonging to neither. His efforts thwarted, he found himself descending into madness, destined to be consumed by the nightmare he was becoming.

She was a loner, withdrawn and anti-social. When one whose regard she valued above all others turned away, she sank into darkness and despair. The madness waited.

The madness drove him to decide that if the world could not accept his enlightenment, it would suffer his madness.

The madness drove her to decide that if the world had no place for her, then it could do without her.

Sometimes, it takes another broken soul to help put your pieces back together.

----
Part of the PWNY-verse.

Edit: Cover art by Sanyo21, commissioned by Level Dasher
Edit 2: Since everyone keeps asking, this is a crossover with the 'Mother' game series. Look it up.

This story is a sequel to My Little Pony: Friendship Is Absurd: Equestrian Gals

Three new students terrorize Canterlot High with hypnotizing music… and much to the frustration of the Dazzlings, it’s not them. Instead, the Shadowbolts (Nightmare Moon ones) have opted to grab their pendants and try to enact the ‘take over the world’ plan themselves, forcing the sirens to try to save the world in order to take it over afterwards. Meanwhile, Twilight drags along a reluctant Sunset in trying to stop ANYONE from achieving world domination. The absurdity is back and as crazy as ever in this parody of Rainbow Rocks!

Takes place after Chapter 28 ("Tirek's Kingdom") of My Little Pony: Friendship Is Absurd.

MLP/Undertale crossover.
Not a PWNY-verse story.

Long ago, the Monsters and Humans fought a great war. The Monsters lost, and were sealed in the Underground. It would take the power of seven human souls to break the barrier that kept them imprisoned. They only had six. And so the Monsters waited and hoped, praying that another human would find their way to the Underground. Some thought the seventh soul would give their King the strength to break the barrier. Some dreamed of a human who would be their friend, and save them all...or had nightmares of one who would bring back the war.

...but nobody came.

...but somepony did.

Eons after the war, with no way to tell how much time had passed above, a tiny blue filly with wings and horn fell into the underground, calling for her Mama. None knew the poor creature's nature or origins...but her soul was powerful with magic, even more so than a human soul.

None can know what will come...of this little 'Woona'.

Cover art by Sanyo21

The mane-six want to have fun at the beach along with Spike. During the water filled weekend, Dash has been acting rather... odd around Spike. Overly teasing; physically getting close to him; acting like it's nothing. Just what is Rainbow trying to tell him?
------------------------------------------------------------------------
Side note ignore the comments about grammar issues I got I fixed and will side future chapters to editors before submitting them.

editors:
http://www.fimfiction.net/user/Megamind+Grant

Twilight Sparkle, Princess Celestia's most prized and faithful student, is being sent to Ponyville to learn about the magic of friendship.

This is going to be fun!

A spinoff of Letters From A Disgruntled Friendship Student by milesprower06.