Rarity and Rainbow Dash have left Ponyville to pursue their lives in Canterlot, and Pinkie is being Pinkie. So AJ, Twilight, and Fluttershy are the only element bearers left in their home town, and one morning, they visit Thorax, only to see Chrysalis flying in. A few hours later, a strange army of creatures they've never seen before comes sweeping in and start to devastate Equestria. Recruiting their friends, the girls try hard to finish Chrysalis off one last time.