This story is a sequel to What If The Shredder Was In MLP: The Movie?

Grogar has formed The Legion of Doom! The group consisting of Chrysalis, Tirek, and Gozy Glow!

Only this time a new member has been added to the roster. One that is hellbent on vengeance against Twilight Sparkle!
The One True Shredder! Ch’rell! Who will stop at nothing to make Twilight’s life a living Tartarus!

After these events, Equestria will never be the same.

(Disclaimer: I do not own any of the images used in this story. All images belong to their respective artists)

After his defeat in Turtles Forever, Ch’rell aka The Shredder was somehow transported into the Storm King’s territory. Shredder quickly deals with the annoying king and takes over his armies. Now with a new army, Shredder will find a way back to Turtle Prime and finish what he started. But he will need the magic of four princesses to accomplish that.

The Storm king wanted to take Equestria? He made a mistake using that staff of his.
Its power awoke something that had defended the land of freedom, the mighty liberty prime.

A newcomer shows up with motivations from unknown to all. His quest for Vengeance and Justice drives him to attack just when the heroes are about to win. He seeks something he has lost and will do anything to gain it back.

Is he the villain or the hero, you decide if his actions are worthy of his motives.

The 1'st Russian Bear Cavalry Unit gets attacked by ponies who attempt to turn the humans into ponies. They inject the serum into all the bears, but are killed. The bears then turn into Ursa Majors and are still loyal to the humans. They then go on a rampage, meet Theodore Roosevelt, and kill every pony on Earth.
Dear Humanity,
We regret being equine bastards
We regret coming to Earth
And we most definitely regret that the Corps just blew up our raggedy ass base!

The Conversion Bureau continues its work, converting the Humans of Earth into Ponies. But such actions have consequences, and untested methods return to wreak havoc upon their creators.

[ONE SHOT] [MASS EFFECT] [THE CONVERSION BUREAU]

A Conversion Bureau Story

Whether it be clothed in a velvet glove, or by the iron hoof it covered, Princess Celestia forced ponification onto mankind, allowing no choice for the species. Only a scant hundred million escaped her law, out of a total of seven billion, whether it be by their own hand, the hoof of an unfortunate pony, or the three million who managed to escape to space in pods that would never make landfall even in the off-chance they would encounter a viable planet. She was confident that all of the apes that had ruined this planet of Earth were either surely dead, or her little ponies.

Millennia later, she would receive a strange visitor from the stars, one that held an agenda that she didn't agree with, but that she herself had given precedence for.

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 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.

Gabe Newell, praise be him! Goes one on one with The Conversion Bureau! The Bureau threatens to permanently close Valve for good and completely destroy modern gaming, Steam, and the chance of a third Half-Life game. So, Gaben takes his complaints straight to the big princess herself: Princess Celestia. Asses are kicked! Crowbars are thrown! Button Mash does some stuff!

Special thanks to: Gabe Newell