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Surviving in a volcanic world is tough enough, but caveman Grug gets a rude awakening when an earthquake forces him to leave behind the only world he knows. With his family in tow, he ventures out into the volatile world in search of a new home. The situation becomes even more complicated when Grug's family - in particular his eldest daughter - falls for a nomad they encounter on their dangerous journey. This quirky, imaginative stranger's search for 'tomorrow' is at odds with Grug's reliance on the traditions of yesterday.