High school misfits Stoney and Dave discover a long-frozen primeval man buried in their backyard. But the thawed-out Link—as the boys have named him—quickly becomes a wild card in the teens' already zany Southern California lives. After a shave and some new clothes, Link's presence at school makes the daily drudgery a lot more interesting.

After thawing, a young prehistoric woman, Lucy, gets herself taken care of by David, a young intern at a marketing firm. Working on a campaign ad for a cosmetics company, David becomes Mr. Bigshot when his protégé is chosen to be the model/spokeswoman for her animal personality.