A cicada creature is attacking Destroido employees after demanding they quit their jobs. Meanwhile, a new teacher at Crystal Cove high is also against Destroido for how environmentally harmful they are, openly criticizing Shaggy and Scooby’s consumption of a Destroido-made snack. Because of the teacher’s love for cicadas and because of Daphne’s appreciation for him, Fred suspects the new teacher. The gang traps the creature at the Cicada Creature Festival, revealing it to be Grandma Moonbeam, the creator of the snack Shaggy and Scooby were eating, who wanted revenge on the company for changing her recipe.
