When Canterlot High School goes on a field trip to Camp Everfree, they're surprised to find a magical force is causing strange things to happen. Twilight Sparkle , with the help of the Mane 6 and especially Sunset Shimmer (who refuses to give up on her), must confront the dark "Midnight Sparkle" within herself and embrace her newfound magical abilities to save the beloved camp from closing down for good!