A few years after the events of "Chapter 1", Twilight and her new friends (Applejack, Rainbow Dash, Pinkie Pie, Fluttershy, and Rarity) are surprised to learn that Twilight's older brother, Captain of the Royal Guard Shining Armor, is preparing to marry her former foalsitter, Princess Cadance in a grand ceremony. While they are excited and eager to help the preparations, Twilight herself is eventually concerned when she discovers Cadance's demeanor is far detatched from the caring, friendly individual she used to be. When her friends, older brother, and even Celestia refuse to believe her, Twilight is forced to rely on her own wits and an unlikely new set of unlikely new allies to stop Cadance's nefarious plan and save the day.
