Out of Sight.

Teenage beach party/spy spoof/musical comedy about a plot to bomb a music fair. As his boss is on vacation, a superspy's butler must come to the rescue, while being pursued by a trio of gorgeous assassins who're agents of F.L.U.S.H. Features George Barris hotrods, along with the musical talents of Gary Lewis and the Playboys, The Astronauts, The Knickerbockers, Freddy and the Dreamers, and the only film appearance of The Turtles.