The cutie map sends the mane six to an alternate universe where crime and villainy have been eliminated, and their counterparts ruthlessly enforce Harmony. In their most difficult friendship mission yet, Twilight and her friends will find their strengths, philosophy and morality tested to greater lengths than ever before. *Concept inspired by Justice League: A Better World

Twilight Sparkle and her friends must battle their mirror opposites from another world. A continuation of the Reflections comic ark and "Of King's and Changelings" (fanmade comic). Links to these are provided, but you don't need to read them to understand the story. Better summary on fim fiction. Also, Ditzy is called Derpy.