Pinkie Pie and Cheese Sandwich have worked hard to create the greatest party ever, a party for the founding of Ponyville, and Luna's birthday among other things. This night will be perfect! But Pinkie finds that sometimes, life is not as it seems...

When Trixie accidentally opens a portal to Downtown City, insanity insues as Blythe and the seven pets enter the world of Equestria. With help from the Mane Six, can they ever get back home? And what do two mysterious figures want with the pets?

(Quite clearly a crossover between My Little Pony: Friendship is Magic and Littlest Pet Shop. Cover art belongs to rmsaun98722 and was made for this story, so permission to use was given.)