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The hillbilly Hatrock family from Arkanstone decide to take up Fred's invitation to drop in a visit the Flintstones if they happen to be in the neighborhood. Before long, however, Fred learns to regret his generosity, as the Hatrock prove to be the loudest, most selfish and most obnoxious house guests in human history. When even a confrontation with the ghoulish Gruesome Family fails to scare off the Hatrocks, Fred must rely upon the hillbillies' intense dislike for "Bug Music", as performed by that moptopped quartet, the Insects (whose biggest hit consists of interminable choruses of "Yeah, Yeah, Yeah!")