Meet The Cobblestones, just an ordinary Stone Age family of cave folk living on Stoney Street, Rock Bottom! But when cave-boy inventor Bobby Cobblestone hatches his very first good idea, he's whisked off to work for none other than the beautiful celebrity Lady Lava! Unfortunately, Bobby is soon up to his Neanderthal neck in trouble when he discovers his new boss hides a dark secret that will rock Rock Bottom to its foundations. With mysterious monsters terrorising the town and a volatile volcano ready to blow its top, can Bobby become a little boulder and hatch a plan to save his family, his friends and his very own precious Rock Bottom? Only time will tell...