Twilight Sparkle has always been known to forgive easily. Many of the worst threats to Equestria have gone unchecked after Twilight forgave them for their actions. But when Starlight Glimmer, a former enemy of Equestria, causes a major accident that endangers lives, Princess Celestia has no choice but to review and approve a plan to implement a checks and balances system against former antagonists—the Reformed Antagonist Regulation Act.

The introduction of RARA splits the Mane Six, and many Equestrians, into two factions. Supporting a former villain's right to choose their own destinies is Princess Twilight Sparkle. Supporting a system of accountability and a fail-safe for potential relapse is Twilight's former friend, Moon Dancer.

Friendships are tested, loyalties are questioned and switched, revenge burns in the air, and all the while, a new threat pulls strings in the background, ready to destabilize Twilight and her friends' bonds forever.

Based on "Captain America: Civil War".

Cover art by the amazing arcanelexicon!

Now with its own TVTROPES PAGE!

The blast of pure love that Shining Armor and Princess Cadence created to defeat the changelings had an unintended side effect: it brought in a blue hedgehog and a two-tailed fox who had just finished defeating their enemy Eggman with the help of their "classic" selves. While Rainbow Dash and Sonic race to see who's the fastest thing alive, Twilight Sparkle and Tails try and find out how the heck a gateway opened up between their worlds. Unbeknownst to our heroes, Dr. Eggman has escaped his exile with the help of none other than Doctor Whooves. Eggman plans to destroy Sonic once and for all. But has Eggman unleashed something he can't control once again? Or will he finally learn the error of his ways?

When Discord escapes and the elements of harmony are no use against him anymore Princess Celestia with help of her sister Princess Luna use a spell to go to an Alterate Universe to bring forth two heroes to help save Equestria. Can these two heroes defeat Discord once and for all? Or will Discord finally win and take over all of Equestria?

Sonic, with the power of the Chaos Emeralds, is accidentally sent to Equestria. Now he has to try and find a way back before anything happens to his home or his friends.

Sonic was enjoying himself on one of his runs, but that was quickly interupted when Discord shows himself and uses his chaos magic on Sonic's surroundings. After hearing Discord's plan to steal and use the Chaos Emeralds, Sonic must get to them before Discord. More surprises shows itself once Time Eater is revealed trying to steal the emeralds as well. After a failed attempt, the emeralds scatter into 5 different directions. New friendships will be made, love will also blossom between two of the characters, a lot of action and humor joins this crew on their journey for the Chaos Emeralds. Sonic and the group must team up to stop Discord and Time Eater once and for all.

Crossover involves:

Sonic the Hedgehog; My Little Pony: Friendship is Magic; Regular Show; Adventure Time with Finn and Jake; Ed, Edd 'n' Eddy and Danny Phantom.

While trying to get home from Camelot, Sonic is accidentally sent to Equestria along with the Sacred Swords and Caliburn. After a bit of confusion, Sonic and the girls try to find a way to send him home. But an evil lurks on the horizon and wants Sonic dead. Will Sonic be able to overcome this adversary or will he fall into darkness. Find out in "Sonic and the Equestrian Knight"! (Tags will be added as necessary)

I've seen this idea done before, but as a fan of Sonic and MLP: FiM, I wanted to give it a go myself.

This, basically, is the story of Sonic Generations, but crossed over with the MLP:FiM universe, with Spike and the Main Six taking the place of Classic Sonic and Classic Tails with other MLP characters also appearing (most aren't listed to prevent spoilers). Except for Green Hill, there will be different areas explored, as well as pony rivals and different era bosses. So while it will have its similarities to the console and 3DS versions of the actual game, it will definitely have its differences too.

Also, in case anyone was wondering, there will NOT be any shipping in this story. At the very least, no crossover shippings. No SonicxRD, TailsxTwilight, TailsxFluttershy, or anything like that. If there is any shipping at all, it will only be between characters from the same universe. And the only humans in this story are Dr. Eggman and the ones that appear in the "Sonic Unleashed" level.

A big thanks goes to bvge on Deviantart for creating the new logo on the cover art. It's a vast improvement over the old cover art.

The TV Tropes page can be found here.

NOTE: Due to the length of many of the chapters in this story, most of them have been broken up into smaller parts of roughly 10,000 words or less to make the story easier to read.

Captain America: Civil War crossover.

This story is a sequel to A Beautiful New Age.

Being the first of her species to travel to another world, seeking to—and hopefully—make peace with its leaders, Princess Twilight and her friends see nothing but a bright future ahead for both Earth and Equus. It all seemed to be going so well.

However, after a devastating terrorist attack brings a mighty blow to the Avengers, Twilight and her friends are unwillingly placed as the next targets. Tensions arise between Iron Man and Captain America, and new players soon emerge into the battlefield, threatening to tip the tide into conflict amongst the shattered team.

To deal with the true threat behind the grand scheme, Tony Stark and Steve Rogers must put aside their differences before the inevitable comes crashing down on top of them…

Two sides of good clashing together, fighting for what they believe is right, breaking partnerships and ending friendships… human and pony alike.

Big shoutout to Shrekzilla for his amazing job on the artwork!

Sequel: Infinity Era

Avengers: Age of Ultron crossover.

Ultron’s plan had come to perfect fruition. There would be no more war, no more chaos, because the ones who caused it all would be gone. In just a short moment, the world would be saved from its true demon. Humans.

It would have all been so much simpler…if it wasn’t for them.

The Avengers.

As it is said, as it always will be, true peace can only be granted through countless innocent lives. In hindsight, the ponies were never that different from humans. Ultron’s plan is not yet over, and soon his strings will be severed…for the last time.

Big shoutout to Shrekzilla for his amazing job on the artwork!
Sequel: This War of Ours

After an accident from their most recent battle, Leonardo, Donatello, Raphael, Michaelangelo, and Master Splinter find themselves in a new world in the search of their nemesis, The Shredder.

Meanwhile, the Mane Six are called to Manehattan to investigate strange occurrences going on at night, bringing them into conflict with the Foot Clan. After a hasty escape, the turtles get discovered by the ponies after saving their lives.

After meeting, can the ponies and turtles stop Shredder? Or will two worlds fall in whatever he has planned?