The Croods need a new place to live. So, the first prehistoric family sets off into the world in search of a safer place to call home. When they discover an idyllic walled-in paradise that meets all their needs, they think their problems are solved ... except for one thing. Another family already lives there: the Bettermans. The Bettermans (emphasis on the "better") — with their elaborate tree house, amazing inventions and irrigated acres of fresh produce—are a couple of steps above the Croods on the evolutionary ladder. When they take the Croods in as the world's first houseguests, it isn't long before tensions escalate between the cave family and the modern family.