The Doctor and his friends arrive by accident at the edge of the Crystal Empire while it's under the tyrannical rule of King Sombra. Naturally they get captured and must now somehow escape.
Sombra was a much more complicated pony than history lent him credit. The Crystal Heart having freed him from the clutches of his own creation, Sombra now tries to find his place in the world. But can he escape the shadow of the past?
When King Sombra returns to Equestria with an army of shadow ponies, Twilight and her friends travel west to seek out an old Equestrian ally to help them save their homeland.
Can the innocence of a young and special foal named Heart's Desire bring out the good in King Sombra, a king whose heart has been cloaked and cursed in darkness for over 1,000 years?
Fluttershy has always believed no situation is hopeless. When she meets an unfortunate orphaned unicorn foal, cursed with an evil shadow that haunts him, she might have just met somepony she can’t save.
Reform a now powerless Sombra. For Fluttershy, it didn't sound impossible, but as time passes she learns the truth. To make this work, he won't be the only one forsaking a familiar road.
Being the King of Monsters, as well as the real ruler of the Crystal Empire was not easy when you are surrounded by enemies on all sides. Fortunately, the perfect opportunity has presented itself to the dark king in the form of four others like him.
A look into the Crystal Kingdom Empire's past, it's ruthless past ruler before Sombra, and the reason why none of the Crystal Ponies have wings or horns.