Movie Story : The prehistoric Crood family sets out to find a safer place to live and stumbles upon a walled-in paradise with everything they could need. Their happiness is complicated when they discover the Bettermans, a family several steps ahead of them on the evolutionary ladder, already living there. As friction grows between the two households, a new danger forces both clans into a sweeping adventure that requires them to accept their differences and rely on each other to survive.