Candace and Stacy get to travel with their favorite band only to find out that they're real snobs. Meanwhile, Phineas and Ferb become secret agents for a day after finding one of Perry's secret lair entrances. Now Perry has to protect the boys while trying to stop Doofenshmirtz. --- Phineas and Ferb help their grandfather relive his glory days as a daredevil. Dr. Doofenshmirtz seeks revenge against a childhood bully that always kicked sand on him.