When Equestria appeared on Earth and discovered the MLP fandom, the initial reaction was of interest. Then they discovered the terrors of The Conversion Bureau, and there was only one way for them to react...

When the ponies came, they tried to convert humanity with words and kindness, saying that they were misguided beings and the princesses would help them on the path to Harmony. When that failed, the ponies tried the potion, only for it's magic to be countered by humanity's science. Then they tried force and failed completely at that.
Finally they decided to let the Barrier defeat humanity and it seemed to work! Nearly 50% of the planet was covered with humanity doing it's best to find a solution.
Unfortunately, the ponies of Equestria are about to learn a harsh lesson that humanity learnt long ago. The Earth can be paradise for those who tame it, but to others it is hell.

When Xenolestia transports Equestria to Earth to begin conversion, she runs into a roadblock. A mysterious human confronts her.

This is an ACB, if you don't like, don't read.

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Now with a Rage Review!

When human base is discovered inside Mount Everest, 30 years of war breaks out leading to the Final Solution.

Ponies have declared man unfit creatures. They eagerly await people to go through conversion, a strangely simple process that can change the genetic structure of a human into that of a pony. They are basically thinking that they caught humanity with its pants down, expecting us to just go along with it.

The hell were they thinking?

Humanity is dead.
It's members have been converted and brainwashed. Its homeworld has been absorbed, and its culture has been eradicated.
Princess Celestia couldnt' be happier.

Unfortunately for Celestia, there are beings out there who don't look too kindly on xenocide. Beings much more powerful than her...

Inspired by Rush's "The Conversion Bureau: Celestia's Silly Plan"

Author's note: For the record, I don't hate all TCB fics. My problem is with the ones that depict humans as irredeemable bastards whose only hope for salvation is to convert themselves into talking horses. They piss me off. They really piss me off.

When the UNSC learns that the Covenant has discoved a new planet for resources. The UNSC sends Spartan-107 to explore the planet and see to if the natives will join forces woth them. But Equestria has never seen this kind of warfare in their history. With their small knowlage of war Princess Celestia and Princess Luna are now forced to raise the army to protect their loyal subects along with the United Nations Space Command.

Everything changes for Twilight Sparkle and her friends when a mysterious extraterrestrial ship crash lands in Equestria. When Twilight messes around in the ship's systems with her magic, she ends up transported to an alien world unlike anything she imagined: a box canyon in the middle of nowhere.

To get home, Twilight must enlist the help of the eccentric Red and Blue soldiers that live there... if she can get them to stop bickering first! Additionally, she finds herself being pursued by the enigmatic military agency known only as Project Freelancer. Back in Equestria, all is not well for Twilight's friends as forces involved with the crashed ship make themselves known. Reds, Blues and ponies will all have to work together to discover the mysterious connection between Equestria and Project Freelancer.

A crossover with Red vs Blue. Written with the intention for the story to be followable without having watched the series. (just don't expect to get all the references).

Now with editors! BradtheBrony and Rough_Draft.

I made a blog post explaining things. You should read it.

TvTropes Page.

What would happen if a third survivor was aboard the Forward Unto Dawn? What if this survivor just happened to mysterouisly arrive to Equestria? We will follow the tale of an ODST who happens to survive an unlikely survival during a crash into the royal courtyard, and what happens after that... well, that is for you to read, and find out...

Cover-image provided by VenetianGhost.

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...