The Neanderthal family the Croods lives in a cave, protected by the father Grug in accordance with the rules of survival that he has learned. His teenage daughter Eep is rebel and questions why the family lives in the dark. One night, Eep sees light and she finds the Homosapiens Guy that can control fire and is intelligent and tells that their world will end. When their cave collapses, Eep seeks out Guy to follow him to the new world. But the stubborn Grug does not accept the change of rules and wants to find another cave to protect his family.