A shadowed creature can be seen on a distant hilltop overlooking Ponyville as the unicorns' magic begin to go awry. Twilight wakes with a start as she realizes that she has slept in for possibly the first time in her life and missed the day out with her friend Rarity. When the magic of every unicorn in Ponyville suddenly begins to have a mind of its own, the lavender unicorn finds herself unable to even use her own magic. Soon she finds herself face to face with a new breed of creature whose intentions for the meager town are unknown.