To escape from Tartarus is nearly impossible, even for one of great magical power. When you've lost your powers and are little more than a withered old centaur, it's even harder. But Tirek has a plan, one that will draw in a creature from a world where life is cheap, hats are plentiful, and gravel is king. Will the Spy take the opportunity to enjoy a well-earned vacation in this new world, or will he see the population of friendly, innocent ponies as just a fresh selection of backs to stab? It could be both!

(Takes place before the beginning of Season 9.)

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.

Pinkie Pie is born to make people smile. It's in her nature.

So after a few strange beings ended up in Equestria, and she got to know Shadow - the serene and lonely Hedgehog - she immediately began trying to make him happy. But so far, it hasn't been working. She's tried everything, but he just doesn't seem to be a sociable guy.

She has already learnt her lesson, thanks to Cranky Doodle. She can't just pester Shadow in an attempt to make him crack a grin. Instead, she has to find out what had turned him into such an introvert. So she decides to throw him a huge, blowout surprise party for him on Hearts and Hooves day.

But she has barely scratched the surface of Shadow's dark history. Little does she know of the things in store for her that particular Hearts and Hooves.