Hairy Trotter is an unusual pegasus. When he got his cutie mark, he was so young that he can't remember what his true destiny was. A little egocentric, he assumes that his destiny is to become one of the best fliers ever. While in Canterlot to audition for the Wonderbolts, Hairy meets Donald Wheat, a farmer who was always outshined by his older brothers and Miley Gray, a purebred unicorn who is very clever, bossy and slightly racist. Hairy thinks that things can't get any worse when he and Don are forced into helping Miley complete a dangerous task. However, a villian once thought dead returns to haunt Hairy, while he struggles to accept a past that his godfather lied to him about.

Four years have passed since the Rainbooms graduated from Canterlot High. Rarity and Fluttershy are married, while Sunset Shimmer is engaged to Flash Sentry. All of them except Applejack attend Cloudsale University. But when Rarity has her first child, a magical dilemma comes up, and she and the rest of her friends must call upon Princess Twilight once again to deal with the mess.

Rose is bored and stressed out. She just stands at her shop all day waiting for somepony to buy her flowers. Lately, nopony has been buying any and she and her sisters are having trouble paying their rent. She decides to try looking through some of the books in Princess Twilight's castle to find tips for selling her product. Another pony from town known as the Doctor goes with her, also looking for some books.

While browsing through the library, they find a magical mirror leading to another world. They get swept in, but then they can't get back to Equestria. How will they handle a species change and being stuck in a parallel universe with no idea how anything works?

Derpy messes around in the Doctor's lab. Chaos ensues.