Danny and Josh are trying their best to stay away from Petty Potts. They don't want anything to do with her crazy top-secret experiments, and they certainly don't want to get turned into bugs again! But when their mom's garden is ruined the day before the big neighborhood competition, the twins turn into bluebottle houseflies to take matters into their own two hands...or rather, into their six legs. Can they act like flies on the wall and find the culprits before it's too late?