When a human tries to kill the Princesses of the Sun and the Moon, along with Princess Twilight and the Element of Honesty- and fails, of course- he's taken into custody after he turns a knife on himself.

Needless to say, Celestia has a lot of questions. How did a human get into her ballroom undetected? What is a human? Why does he have such a good grasp of alchemy?

And why is he a subject of Queen Chrysalis?