Two young men, played by Sean Astin and Pauly Shore, trying to navigate the confusion and craziness of high school have their minds blown when they discover a pre-historic man, played by Brendan Fraser, preserved in a peaceful California backyard. After thawing him out, they attempt to introduce him to modern day society with mixed results. Everyday worries like asking out a girl or trying to fit in with the cool crowd become monumental as they try to keep their new friend in line.
Sean Astin and Pauly Shore find out that having a caveman in your posse can make life hilarious one moment and hellacious the next. The adventures that ensue prove that friendship is not bound to the decade you were born in, and loyalty is not an invention of modern day man.