"With every sun comes a new day. A new beginning. A hope that things will be better today than they were yesterday. But not for me. My name is Eep. And this is my family, the Croods. If you weren't clued in already by the animal skins and sloping foreheads, we're cavemen. Most days we spend in our cave, in the dark. Night after night, day after day. Yep, home sweet home. When we did go out, we struggled to find food in a harsh and hostile world. And I struggled to survive my family. We were the last ones around. There used to be neighbors. Uh, the Gorts, smashed by a mammoth. The Horks, swallowed by a sand snake. The Erfs, mosquito bite. Throgs, common cold. And the Croods, that's us. The Croods made it, because of my dad. He was strong, and he followed the rules. The ones painted on the cave walls. Anything new is bad. Curiosity is bad. Going out at night is bad. Basically, anything fun is bad. Welcome to my world! But this is a story about how all that changed in an instant. Because what we didn't know was that our world was about to come to an end. And there were no rules on our cave walls to prepare us for that."