This story is a sequel to Equestria Wars Episode XIII: Revenge of the Lunar Republic

Charming Thunder has been gone for three years and has not returned. Worried about what happened to him, Starlight helps search for him with the help of the princesses. Twivine Sparkle hunts him down and will not rest until he is destroyed. Now their focus is a BB unit that carries a map with the location to Charming Thunder's whereabouts. Who will find the droid first? The hunt is on.