Gumby rocks out with the Clayboys for a concert benefiting local farmers. But things go awry when Gumby's arch enemies, the Blockheads, dognap his pet pooch, Lowbelly! Bad turns to worse when the Blockheads also kidnap the band...and replace them with clones! The battle between Clayboys and clones is filled with trains and planes, knights and fights, thrills and spills!