One of Equestria's greatest traits is tolerance. Every pony, whether Unicorn, Pegasus, or Earth, is accepted for who they are, and have their own parts to play in keeping Equestria running.
But what if an Earth pony decided he didn't want to play his assigned part? What if he wanted to rise above everyone else and become an Alicorn? Such a thing is possible... but the path to fulfilling one's dreams is never simple. Risks must be taken. Sacrifices must be made. And the question is always asked: How far would you go to get what you wanted? And would you be willing to pay a terrible price to get it?