An MLP: EQG take on the famous 1963 Jerry Lewis film, The Nutty Professor, which is a comedy version of the classic Robert Lewis Stevenson story, Jekyll & Hyde.

Twilight Sparkle, the smartest student in all of Canterlot High School, has just fallen in love with the school's top music player, Flash Sentry. Only problem is, she's not all that good at talking to guys. That, and she's a little...geeky.

One day, she accidentally creates a magic potion that creates a whole new personality! She drinks it and creates her alter ego, the stunning fashionista, Rarity Darling, a fashion girl that will flirt with any guy and have them follow her all over the place.

After discovering that Rarity has caused a small bit of trouble, Twilight vows to stop taking the potion. Only problem about that is, Rarity wants to exist more. So much that she plans to create her own potion, one designed for erasing the dormant personality.

Soon, the two personas fight for two things, for their existence and for the heart of a certain blue-haired guitar player. Will Twilight defeat her fashionista self? Or will Rarity be rid of her former self and finally be free?