The Curse of the Night

Nightmare Moon was thought to be gone forever. Mysterious magic that had cursed Princess Luna returns to haunt the ponies of Equestria and infect them with a horrible curse.

Twilight was happy to reacquaint with the Princess. It had been a long time since they had spoken. When Twilight received the Princess's letter, the young alicorn rushed to Canterlot, for she feared that what the Princess had described in her letter wasn't true.