Trixie is coerced into searching for a missing foal and finds out what kind of pony she is at heart.

King Sombra's story, as told by him.

The Great and Powerful Trixie is coerced into searching for a missing foal, against her own better judgment. But when push comes to shove, what kind of pony is Trixie at heart?

When evil threatens Ponyville, the ponies must pit their mortal strength against an ageless malice.