You don't know who you are. You don't know WHAT you are. You've only just hatched, and nothing is explained to you. You are swapped with the foal of a pair of loving mares, and are expected to play the part of the perfect imitation.
Sometimes the girls at CHS forget Sunset is a pony, so when Rarity finds a rather odd bottle of shampoo in Sunset's bathroom, the confusion is understandable.
Cold Brew is working the afternoon shift during the Royal Wedding when a changeling drops by the coffeehouse in the middle of the invasion and gets rather...distracted.
Rarity had always known she would have an arranged marriage—such was the life of a princess, after all. She just hadn't expected her wife to be a sphinx or that she would actively avoid her, and not just because she loves books.
Equestria always needs saving and now there is the worst pony for the job. A story about how things never go as planned following the life of a young, depressed unicorn destined to be a hero whether he wants to or not. SPOILER: He doesn't.
Tonight was supposed to be a good night for plucky Nightguard Mothchaser. She'd finally screwed up the courage to, secretly, at night, slip a letter under the door of her crush. Sadly, as often occurs around Mothchaser, things do not go as planned.
Twilight Sparkle is Dead. Her friends decide this isn't an acceptable state of affairs and vow to change it. They really should have compared notes first.
Sunset Shimmer has always known that magic was real. After discovering the portal hidden outside Canterlot High, she leaves her life behind to go inside and prove it. Equestria will never be the same.
Twilight and Chrysalis have come a long way in their relationship over the years. As their wedding looms, Twilight is about to learn a terrible secret.
50,000 years ago, wild ponies ran free across the meadows and plains. Then something changed the course of history in Equestria forever. The gray foal was witness to this.
Ocellus and her friends only planned to sail to Manehattan for their final project. They never imagined a storm could take them... a little further than that.
He had resigned himself to stand before his queen, to learn of his place in the hive's latest invasion, but instead witnesses the fall of the queen's empire. Misplaced and frustrated, Vertex must now turn to his newly-crowned king for answers.
Debauchery. Wickedry. Mayhem. These things, Stasis holds close to his heart. Can he stand fast in his ideals against his adoptive father, Star Swirl? Or will the saccharine sentiments of the ponies ultimately corrupt the little changeling prince?
When Princesses Celestia and Luna visit a public art gallery, they come upon a painting of Celestia, banished to the moon. They react to this in the only reasonable way: artistic criticism and analysis.
There are thousands of stories about changelings lost and broken after the explosion ending the invasion of Canterlot. After all, there were thousands of changelings caught in it. Some found love or peace, and some found death. I'm just one of many.
Swansong, an exiled Changeling, is living in Equestria, surviving by any means she can. As her little hatchling grows, Swansong knows something is wrong.
Suspicious about her actual relation with the rest of her family, Apple Bloom had some tests done in secret. The results were... unexpected, to say the least.
A simple Tunneler drone is catapulted from Equestria during the infamous Wedding onto earth. Confused, injured and alone, the drone must figure out how to survive with the whole world watching. (Changeling on Earth, Xcom, Men in Black and SG:1 Xover)
The rebels planned things well. They've broken through and Celestia is the only one left between them and the throne. Now all they have to do is take it.
Twilight just accidentally killed everyone in Ponyville. Celestia's coming to visit later that day. She has to think of something to keep her from finding out, and fast.