One fateful day, the orange star appeared in the heavens, then exploded into a supernova, causing the planets of Disney and Equestria to merge as one. Legendary Sorcerer Yen Sid of Disney and Princess Celestia of Equestria will be watching over the balance of their new world as their students Mickey Mouse and Twilight Sparkle, along with their friends--old and new--to embark on a journey to travel all over their new home world to ensure every soul's safety.