Rainbow Dash has a secret. An embarrassing secret. Coming from a long line of race ponies and pegasi, there's only one member of her family that isn't awesome. Grandpa Prism, a unicorn. A weird unicorn. Weird as in he experiments with magic. Magic like enchantments and potions. Magic like, blegh, love.

Naturally, she's hesitant when a package arrives in the mail. A strange package from her strange grandfather. But it’s the inside that counts.