It's a Saturday at the beginning of May. Cosmo, Timmy, and Poof are bored, so Cosmo turns on My Little Pony: Friendship Is Magic, and Applejack, Fluttershy, Rarity, Twilight, Rainbow Dash, Pinkie Pie, and Spike appear in Timmy's bedroom! He unintentionally makes a wish that all the characters were in Ponyville, and Cosmo and Wanda have to grant it. After they get there, Applejack, Pinkie Pie, Fluttershy, Rainbow Dash, and Rarity find their cutie marks have been switched, and no one knows how to fix it because it wasn't a unicorn that did it this time! I only tagged it "anthro" because of the end part, you'll see when you get there (and obviously the fairies)!