No pony knows what Count Sombra really is — they just know that ponies have been disappearing. So when he goes to Canterlot in hopes of finding his beloved, he brings terror along with him.

In each of us there are two natures. If this primitive duality of man, good and evil, can be housed in separate identities, life will be relieved of all that is unbearable. It is the curse of mankind that these polar twins will be constantly at war.

The world will remember them. And they’re going to make sure of it. Even if it costs them their lives.

Dr. Pinkie creates a potion that separates good and evil.