On the second anniversary of Twilight Sparkle's arrival in Ponyville, her B.B.B.F.F. Shining Armor pays an unexpected visit with some dire news. A mysterious unicorn is trying to use chaos magic to release Discord and bring chaos upon Equestria once more. Shining Armor must travel with his sister and her friends to find a powerful artifact that can stop this pony from succeeding in his plans. Along the way, Twilight learns some things about her brother and realizes she may not know him as well as she thought she did…