Mya orders Mantyz to sabotage a Freefonix concert with a sonic scrambler. Trouble is, Mo has rigged the Bounce with sonic booby traps, making it impossible for Mantyz to break into the club. Meanwhile, Snug Fitt introduces Freefonix to his sister Chandra, an insecure, under-confident teenager. BB becomes convinced Chandra is a sonic guardian and bets Freez and Mo one Chocko Ducko she can prove it. But when Chandra learns about the bet, she mistakenly believes BB was just using her and, in an act of spite, agrees to help Mantyz sabotage the Bounce. As the concert starts, Freefonix's music becomes scrambled, and Chandra realizes the error of her ways. She jumps in to help Freefonix, and everyone realizes she is a sonic guardian, but her powers only work when sound waves are scrambled!