It's Nightmare Night and Discord's first since he was reformed. He's been looking forward to it for months and even put together a neat costume to go with it. Until Celestia sends him a message saying he's not allowed to go.

Down in Ponyville, the ponies are preparing for a night that will never be forgotten- but nothing could have prepared them for this.
Spike's an alicorn, Twilight's a dragon, Rainbow Dash is her favourite daring adventurer, Rarity's a vampire, Pinkie Pie and Applejack are changelings, Fluttershy's dead and Sombra and Chrysalis have returned. And I'm not referring to costumes!

What is going on here?!

Edit: ANNYNF was featured on July 24/07/2014! Thank you for this surprise feature :D !