No one ever said being a new parent was easy, especially if your wife is a changeling. Regardless, there is a little one on the way, and Rhino and Gel will have to learn how to be parents, as well as dealing with the first pony-changeling hybrid.
The Mane Six have become alicorns! While studying new alicorn spells, Twilight finds an old book from Celetia with a new spell. Sadly, the spell sends the mane six, along with other mares are sent into a new world. The Disney world!