After Diamond Tiara goes to far, Silver Spoon stands up for AppleBloom. Then Silver Spoon vows to never be a bully again. She even promises to get Diamond back for making her a bully in the first place. She does something that could put all of Equestria in danger. Without the Elements (The mane 6 are in Hoofington, but do make a appearance after villain(s) are defeated.) the danger could never be resolved. When all hope seems lost, two (very) unlikely heroes emerge.