For Halloween the Cutie Mark Crusaders go for free cutie marks. It is actually a foal killer's trap and they are held captive. Scootaloo and Applebloom give up and accept their fate but Sweetie Belle stays hopeful. Using some magic she undoes the bounding and hops out. She starts to untie her friends but the Killer comes in and Sweetie Belle saves herself. Will any of them make it out alive? Will they unveil the Killer? Only one way to discover how.