It's Beach Blanket Bongo! Catch a wave as Bart discovers Grampa's secret past as a surfin' stuntman/soldier of fortune! Under Grampa's tutelage, Bart enters a police sponsored surfing competition, but a freak tsunami causes Bart and Grampa to team up for the ride of their lives. Hang on for dear life as Bart and Grampa hang ten! Cowabunga!