Teen surfing sweethearts Brady and McKenzie together ride the last epic wave of summer, one that mysteriously carries them into Brady's favorite movie, the retro surf musical movie, "Wet Side Story." There, it's bikers versus surfers for control of the local hangout? and everyone spontaneously breaks into song and dance. McKenzie and Brady must try to return to present day, but their lives may be changed forever when they inadvertently alter the movie's romantic storyline and the handsome leading man, surfer Tanner is falling for McKenzie while biker girl Lela is swooning for Brady.