If surviving in a volcanic world wasn't tough enough, try having a daughter whose curiosity endangers the whole family when she decides to do the forbidden - leave the cave.
Welcome to the like of Grug Crood, a simple caveman who is well-meaning, but a little overprotective and outdated.
When an earthquake forces the Croods to abandon their home and leave behind everything they know, they must survive the adventure and danger of the outside world as they search for a new home. If things weren't complicated enough, the family gets in deep water when they meet a strange nomadic caveboy named Guy. Though not as physically strong as the Croods, Guy prefers using his brain, something that attracts the curious Eep.