After a smash and grab mission goes haywire, the Master Chief finds himself in Equestria. As he meets the ponies we all know and love, his past with Cortana haunts him as he struggles with his new life.

But a threat who wants revenge makes their move . Will John 117 move on from the past to face the enemy, or will he not care and doom the ponies to their fate?

In the pony timeline, this takes place after Tirek is defeated. In the Halo timeline, it takes place after Halo 4 and before the events of Halo 5.

Edit 1: Changed the rating from mature to teen. Tell me if I should keep it the same.

As the Human-Covenant War nears its end, a small team of Orbital Drop Shock Troopers find themselves teleported to the magical land of Equestria. But they did not come alone. An entire battalion of Covenant have teleported with them. Now the bloodthirsty aliens have set their genocidal ambitions on the peaceful ponies of Equestria. The ponies must place their hope in the small team of humans to save their species from annihilation. But Equestria will have more to fear than the Covenant, as a far greater threat descends upon their planet...

It has been several months since the disappearance of Twilight Sparkle..

One night, after watching her sister raise the Moon and set the heavens alight, Princess Celestia begins to bed down for the night, only to be interrupted by portal forming in her room. From out of the portal comes none other than Twilight Sparkle, garbed in strange armor.

Princess Celestia, along with Luna, Cadence, and Shining Armor, are overjoyed by the Element of Magic's return, but are justifiably curious as to where she had been and what she had been doing. And so, Twilight begins her tale. A tale of survival against impossible odds. A tale of a people fighting for the most basic right of all sentient beings. The right to exist.

Terrorism, in the past century, has come to be one of the greatest threats to nations all over the world. It has always existed, and may always exist and threaten peace. Despite the danger, governments still bicker, as usual, and hamper any real attempt to counter it.

Officially, there is no multi-national effort to combat any and all terrorism. Unofficially, that organization is Rainbow. Consisting of the best soldiers from nations around the world and armed with the best equipment, this 'blacker than black' unit battles terrorists wherever and whenever; no matter who they are by any means necessary.

These men, who do not exist, receive no real credit for the battles they fight and the lives they save. That doesn't matter; even existing doesn't matter to them. They are dedicated to protecting innocents from an enemy who seems everywhere and nowhere, no matter where they are...

TRIBUTE:
In memory of Tom Clancy. R.I.P. (April 12th, 1947-October 1st, 2013).

"One way or another, we all fight for what we believe in. Doesn't that give us some common ground?"

-Jack Ryan, The Cardinal of the Kremlin

NOTES:
This will be a cross of both the book and the game series. Characters from the book will appear first, game characters will come later on.
Rater T for language and violence.
My Little Pony: Friendship is Magic created by Lauren Faust and owned by Hasbro.
Rainbow Six written by Tom Clancy.
Rainbow Six video game published by Red Storm Entertainment and Ubisoft.

After Spike's growth spurt, Celestia decided that its time for the young dragon to be taught what it means to be a dragon. So she contacts the distant universe of Avalar and asked Spyro to teach the young drake, which of course Spyro accepts. Now Spyro must deal with training a dragon who doesn't act like a dragon, keeping the populace of Ponyville under control, and fighting off the remains of the Dark Master's forces who have somehow followed him. Luckily he's got Cynder and Sparx alongside to help...right?

EDIT: Very late in saying this bu thank you everyone for getting this story to be featured. Means a lot to me.

Basically this is a T-rated crossover that takes place after the events of Dawn of the Dragon. I should mention that this story will contain spoilers for anyone who hasn't played that game. Of course, I don't own anything except for this story.

The Dark Brotherhood has fallen by the hands of the newly atoned Dragonborn and the responsibility of establishing a new sanctuary falls to Shadowmere. However, a horse, holds little charismatic charm among the people of Nirn and, thus, must look for alternative means of recruitment. By Sithis's command, Shadowmere traverses the plains of reality into Equestria.

Sequel to my previous Dragon Age crossover Ponies and Grey Wardens: The Equestrian Age.

Years after Equestria was visited by the strange, bipedal creatures, their stay there has yet to be forgotten. But now, a dark force from both the world of the Grey Wardens and that of the ponies meet, creating a threat that will ravage all in its path.

With both of their lands at risk, the people of both worlds must come together once again. Reunions will be had and new bonds will be created. But with a powerful enemy that none are prepared to face, will the heroes of Ferelden and ponies of Equestria be able to stop it? And what will be lost in the attempt?

Due to a combination of blood magic, an ancient elven artifact and the well placed punch of a golem, the Commander of the Grey and several of his fellow Grey Wardens find themselves in the magical land of Equestria.

Coming from a land that not only has magic, but fears and mistrusts those who use it, how will they react to see land of ponies who depend on magic to keep their lives in perpetual harmony? How will the ponies react to the strange creatures coming from a land of bloody conflict, demons and magical intolerance?

A Dragon Age crossover.

It was just a normal day for Twilight, Pinkie and Octavia. But when they are gathered because of an exciting find, they got a surprise that the find will grant them the powers of anypony ever realize.

The power of a Soul Reaper
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Bleach Crossover

An ODST ends up on an un-mapped sector of the universe. He discovers a world that is inhabited by humans while he was tracking down a damaged Covenant Corvette which was carrying a valuable object that belonged to the UNSC.

Equestria has been at war for three years against the Griffin Kingdom. When the alien ship crashes the Equestrians discovered that they are not alone. When the ODST encounters the natives he learns that no matter where he goes war is still the same.

ALL MLP characters Humanized. Equestria and the rest of the world have achieved certain inventions. Cars, Planes, Phones and stuff like that.
Sorry for the terrible description.
HALO belongs to bungie
MLP:FIM belong to hasbro
coverart image is by johnjoseco