When Russ is bullied by Garth, Toby tries to prove Russ is not a loser. Toby creates a time portal to show Russ his ancient, valiant ancestors. But things go horribly wrong. The time machine is damaged and Russ finds that he's swapped places with his 350,000-year-old hominid ancestor, Rog. While the caveman battles with Garth at a twenty-first century school, Russ is hailed as leader of a tribe of cave-dwelling hunter-gatherers.