Meet The Cobblestones, just an ordinary Stone Age family of cave folk living on Stoney Street, Rock Bottom!

But when the cave sisters who are inventors hatch their very first good idea, they are whisked off to work for none other than the beautiful celebrities Lady Lava and Lady Ash! Unfortunately, the sisters are soon up to their neanderthal neck in trouble when they discover their new bosses hide 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 the sisters become a little boulder and hatch a plan to save their family, their friends and their very own precious Rock Bottom?

Only time will tell…