While digging a pool is his backyard, Dave Morgan (Sean Astin) and crazy best friend Stoney Brown (Pauly Shore) are two high school loners that stumble across a frozen caveman (Brendan Frasier). The caveman comes alive when the ice melts and the boys give him a life in the 20th century. They name him Link and teach him about all the changes around him. The boys leave Link's origin a secret and tell everyone he is a foreign exchange student. Dave Morgan (Sean Astin) lets Link's popularity get to his head and Matt Wilson (Michael DeLuise) become jealous of Link and tries to find out the truth about this mystery guy.