When Storm Stripe moves into Ponyville, it isn't long before he's invited to his first "Pinkie Party". But when the party is over, he finds Pinkie Pie feeling surprisingly sad, and offers to cheer her up as best as he can. What he doesn't know is that he isn't helping Pinkie Pie, but Pinkamina Diana Pie....who intends to use Storm Stripe's offer for her own, dark, plan.