It soon becomes apparent that Stoney's bizarre attitude is having an effect on Link's actions and speech, which causes a rift between Dave and Stoney and after a fight with Matt at a skating rink, as well as an attraction developing between Robyn and Link. They manage to fool Dave's family into thinking he is actually an Estonian exchange student sent to live with them, and enroll him in school where Link's bizarre behavior and supreme athletic skills shoot Dave and Stoney to popularity by association, allowing Dave to get closer to Robyn, to Matt's chagrin. After bathing him and trimming him to look like an average teenager, Dave names him 'Link' as in the missing link. At first, the caveman panics at the sight of them, but then Stoney quickly calms him by using the flame of a lighter to mesmerize him after he panics from the phone ringing. Investigating a beeping smoke alarm, they discover the caveman in Dave's bedroom, attempting to start a fire 'Indian-style' by rotating a stick in the center of a pile of kindling.

When the boys return home, they find hand paint covering the walls and the house is in disarray. The caveman falls head first into the 20th century, discovering a garbage truck which he misinterprets as a mammoth from his time, and television which he discovers upon entering Dave's house. They leave the ice block unattended in the garage and space heaters left on cause the ice to melt, releasing the caveman from the opening of the film. One day, as Dave is digging a pool in his back yard, he comes across a chunk of ice that has the body of a man in it following an earthquake. Her boyfriend Matt Wilson ( Michael DeLuise) is a dimwitted jock and school bully who is constantly responsible for making both Dave and Stoney the objects of ridicule by embarrassing them in various ways, usually directly due to Dave's growing affections toward Robyn. Dave is in love with Robyn Sweeney ( Megan Ward), a sweet and attractive girl who has been his best friend since grade school, and until she reached 'babehood' had been rejected by Dave on several occasions. He, along with his best friend Stoney ( Pauly Shore), strives to attain popularity in high school but comes off more as a reject and an outcast.

This segues into a present-day Los Angeles earthquake that awakens average teenager Dave Morgan ( Sean Astin). An earthquake causes a cave-in that buries the two of them. During the first ice age, a caveman ( Brendan Fraser) attempts to make fire with his girlfriend ( Sandra Hess).

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