Everypony knows the myth! Go into a bathroom, shut off the lights, chant her name into a mirror three times. But a colt and two fillies are about to find out just exactly nopony has any evidence of the mysterious legend.

Every happy, innocent, kind and harmony world, full of promise, has a cousin... Born dark, evil, hateful and decietful. The two are never suppose to meet, and never will meet... Until... Now...