Pinkie Pie and the rest of the town like welcoming new ponies, so when a new family moves in so everyone is excited to welcome the new ponies, but what happens when one of those ponies is well... not a pony?
Wait! So Rarity's being impersonated by a changeling? And Twilight too? And... the rest of the Elements of Harmony? Okay. So what's the big deal again?
Four defective Flood Juggernaut Elite Forms land in the world of Equestria. They will meet new friends and foes on the journey to redeem the name of their species.
Chrysalis sends seven changelings to Ponyville in a clever attempt to break up the Elements of Harmony. Things do not go according to plan for either the changelings or the ponies.
The rest of the group (except Spike) has dropped in to see how things are going
Twilight noticed Applejack rubbing her shoulder. "You ok, Applejack?" "Aw, tain't nothin'. OK, everyone, let's give it a whirl! Start the music, Rarity!"
Rarity turned on the music and the Ponies and Changelings started the dance.
Applejack recovered first, and exclaimed, "Um, ok, that was almost perfect! Everybody take five! Um, i mean, take a five-minute break, um, make that ten minutes."
The dancers all left and the group recovered.
"Dear Princess Celestia, today I learned that Changelings are VERY literal-minded, we must be VERY careful what we say to them."