Joel gets a new Homo Sapien friend, Jake, but Nick suspects he's a caveman trying to blend in. Also, Nick considers Jake to be a shaver, a person who shaves his body hair to differentiate himself from cavemen. Meanwhile, Thorne is attracted to the beast in Andy.
Cavemen revolves around Joel, his younger brother Andy and best friend Nick. Joel is engaged to Kate. Even though he has some problems with her conservative parents accepting him, he is happy with his life and pursuing the American Dream. The pilot is based on the Geico commercials that claim their service is so easy, "Even a caveman can do it".