One is the fabled Mare in the Moon, who once threatened to cover Equestria in eternal night. One is the deposed Queen of the once-terrifying Changeling race. These two beings have cast long shadows over the history of ponykind, but never before have they done battle with one another. Who would come out as the victor? Well, this is a question that is on the minds of some of Ponyville's most enthusiastic debaters.