Joel runs into trouble when he parks in an executive's parking space. Nick competes with Maurice for the attention of his ex-girlfriend, Heather, after Maurice explains his own charm with women in terms of hunter and gatherer roles, classifying himself as a hunter and Nick as a gatherer.
Neighbors who adopt a cave kid ask Joel, Nick and Andy to be his mentor.
Andy participates in Nick's open mike night, and becomes famous for his character of a dumb caveman.
The boys are throwing a party because it is Long Night, a cavemen holiday that remembers when the cavemen did not die in the coldest day in history.
Andy has people coming at him from two different directions: Nick and Joel want him to vote their way in the next election, while Thorne wants him to buy a gun after a burglary.
Joel, Nick, and Andy visit a frozen-yogurt shop, and Nick falls for the hot cavewoman who works there.
Joel thinks that his girlfriend is embarrassed to tell her friends that she is dating a caveman.
Joel, his cynical best friend, Nick, and easy-going little brother, Jamie, are contemporary cavemen who live in the suburban south and simply want to be treated like ordinary thirty-something guys. Despite their attempts at assimilation, Nick doesn't believe mainstream society will ever completely accept them, Jamie seems to take it all in stride and Joel straddles the middle, torn between his friends, his more traditional values and his loving fiancée.