Meet the Croods, the only caveman family still alive because they think new discoveries are dangerous. One night, their oldest child, Eep (stone), sneaks out and meets Guy (Reynolds), an inventive person who knows things the others don't. Later, in the morning, their cave is crushed by what he calls "The End". Grug (cage), Eep's father, is sad their cave is gone. Now they need to figure out how to survive with the help of Guy in a new set of open land.