How do you hide a super-secret spy operation? Use your boring family holiday as a cover! (OBVIOUSLY.) G.A.G. is Metal Face's super-cool new band, and Danny and Percy are determined to copy their idol and make some noise. They're not alone: the whole school is obsessed! With Battle of the Bands on its way, the disaster duo faces their greatest challenge yet. Can they put on the show of a lifetime? Or will it all go up in smoke?