When Twilight's portals release Tirek into the human world and the humans get turned into ponies, they have to unite with their ponyselves to defeat him and save both world's.
This is the story they never wanted to tell you. This is the story about your favorite characters that has been kept secret. This is the story... behind the laughter.
"I believe a light will pierce the darkness and drive it away. I believe that someday we'll be able to laugh again under the clear blue sky. And I believe that Amethyst Star will be that sparkling light." [GUYVER PONIFICATION BEGINS]