Trixie, enraged by her humiliation at the hooves of Twilight Sparkle, finds some stone-cold help from a person long forgotten….

Meanwhile, both Princess Celestia and Twilight Sparkle have been afflicted with nightmares. Grim nightmares.

When Discord shows up again, he wreaks havoc… Destroying the Sun.
There's only one way to bring back the sun.
A sacrifice.