Throughout Equestria, ponies cherish the unique symbols upon their rumps, which boldly represent their special talents and life long passions.

However, for a select few, gaining their cutie marks and realising what makes them special has caused nothing but heart ache and despair. It is these ponies who form the cutie markless; a group lead by Starlight Glimmer - a powerful unicorn with the ability to remove a ponies cutie mark, and replace it with one which represents nothing but equality.

So who exactly are these ponies? And why did they decide to give up something as precious as their individuality?