The students of Canterlot High School prepare for the Friendship Games, an academic and sporting competition held every four years between their school's team, the Wondercolts, and the undefeated Shadowbolts from Crystal Prep Academy. Sunset Shimmer, who has been observing her friends' magical ability to "pony up" – grow pony-like ears, tails, and wings – whenever they play musical instruments, becomes concerned when Rainbow Dash transforms during a pep rally, seemingly at random. Tasked with finding the cause of this development, Sunset attempts to contact Twilight Sparkle for advice but receives no response.