My Little Pony: Equestria Girls#Twilight Sparkle visits the Crystal Empire for her first royal summit following her coronation as a princess of Equestria. My Little Pony: Equestria Girls#Sunset Shimmer, a rogue student of List of My Little Pony: Friendship Is Magic characters#Princess Celestia, emerges from a mirror portal during the night and steals Twilight's crown, which is embedded with one of the magical Elements of Harmony that protect Equestria. After a chase through the castle, Sunset drops the crown through the portal and follows after it. The other princesses explain that the portal leads to an Parallel universe (fiction); as the other Elements of Harmony are unusable without the crown, Twilight is tasked with retrieving it from the other world before the portal closes for thirty Lunar month. Despite Celestia's insistence that Twilight must travel alone, Twilight's assistant, My Little Pony: Equestria Girls#Spike, anxiously runs after her into the portal.