After surviving the end of the only world they knew, the Croods must find a new place to call home. They set off into uncharted waters, and soon enough, they come upon a haven that can provide for their needs. Unfortunately, there is a small problem: another family has already taken residence in the area. They are the Bettermans, and they have an intricately-made treehouse, effective farming, and many impressive inventions. It doesn't take long for the prehistoric to clash with the modern.