This story is a sequel to Sonic Generations: Friendship is Timeless

Everything seemed to be going so well since the fall of The Last Ancient. Twilight and Starlight's time in Sunset Shimmer's world had granted them what they thought would be the final piece of the puzzle that they needed to reach the world that Equestria had almost joined with due to the disruption of time and space. And then Princess Celestia and Princess Luna announced that they would be stepping down.

In her efforts to restore the Warp Ring in the hopes of seeing Sonic and his friends one last time, Twilight inadvertently provided an easy back door to Equestria, allowing Dr. Eggman's chief enforcer to reach it and eliminate any threats the land may pose to the Eggman Empire. As part of his revenge for foiling his plans in the past, Eggman gave strict orders to drag Twilight and her friends to his world so they might see his glorious reign before he ends them for good. Luck proved to be in their favor, however, as the arrival of two friends who haven't been seen in a long time threw a wrench in the works and allowed them to be found by a band of freedom fighters known as the Resistance, led by more of their old friends from that world.

Now part of the uprising to reclaim the world, the Equestrians are hoping to help their allies, new and old, win their war, but time is not on their side. It is the darkest of times for the world, but their efforts may prove to be for naught against their seemingly unstoppable enemy.

Will their friendship and the smallest amount of courage be enough to turn the tides of war?

This story is a sequel to Sonic Generations: Friendship is Timeless

Totally not a spin-off to "Sonic Generations: Friendship is Timeless"; it is a sequel.

When an old, Ancient enemy resurfaces in the world of the Blue Bomber and his heroic friends, craziness ensues when they try to stop him that ends up sending everyone to a whole other world.

Stranded far from home, Team Sonic must make new allies and attempt to fit in in this new world while also trying to gain the trust of its inhabitants and reclaim the Lost Crystal of Power before their foes do.

Will Team Sonic be able to balance a life of their typical heroics with going to school? Will their new friends be able to show them new powers they'd never imagined were real before? Will Amy finally get her new snakeskin boots? And will Sticks eventually stop messing with the author?

"Don't count on it."

Find out in this, the ultimate crossover of awesomeness!

Spin-off story to "Sonic Generations: Friendship is Timeless", taking place between chapters fifteen and sixteen during the train ride to Canterlot.

Everyone knows that Sonic, Tails, Spike, the Main Six, Shining Armor, and Princess Cadance set out for and arrived at Canterlot aboard the Friendship Express to find and stop the monster that had intertwined two worlds and their fates together, but what happened along the way? While Princess Celestia and Princess Luna went on ahead and prepared for their arrival, Equestria and Earth's heroes had to go through more adventures in order to get to Equestria's capital city. Now, the story of their lesser known adventures shall be told.

So climb aboard the Friendship Express, grab a seat, and get comfortable. It's going to be quite a ride.

Sonic Generations: Friendship is Timeless TV Tropes page can be found here.

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

The Civil War is over. The Autobots and Decepticons have been destroyed. Peace…is finally present in the magical land of ponies. Over a year later, while enjoying a night out with Spike, Princess Twilight Sparkle encounters an old friend deep within the Everfree Forest.

This was the worst mistake the Princess of Friendship ever made.

What follows next will lead our six friends into a new type of conflict they never thought existed, evils they never dreamt possible, and a battle…for their very lives.

And their ever-changing world.

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Official sequel to Transformers: Equestria's Darkest Hour and the final installment in the Fall of Equestria series.

Once more, a big thanks to edCOM02 for his amazing work on the cover art!