After being humiliated at school, the Cutie Mark Crusaders go to Zecora's hut in search for something that can make themselves get even with Diamond Tiara and Silver Spoon; and they find it in the form of a book with the word "Betelgeuse" enscribed upon it. The instructions were simple: say Betelgeuse three times. But as soon as they did, they didn't know that they were about to bring forth a disaster that only the master of chaos can fix.