"[opening narration, first lines of the film] 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's Eep, and this is my family, the Croods. If you weren't clued in already by the animal skins and slipping 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 our harsh and hostile world, and I struggled to survive my family. We were the last ones around. There used to be neighbours. The Gorts, smashed by a mammoth, the Horks, swallowed by a sandsnake, the Ervs, 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."