Canterlot High is hosting a musical showcase and Rainbow Dash, Applejack, Pinkie Pie, Rarity, and Fluttershy perform as The Rainbooms. But when a new group, The Dazzlings arrive they convince everyone to turn it into a Battle of the Bands. As tensions mount, Sunset Shimmer realizes the Dazzlings are far more sinister. The Rainbooms call on Princess Twilight to help them perform a musical counter-spell so that they can win a battle that now determines the fate of the entire school.
