Brendan Fraser plays Link, the caveman who is discovered frozen in a backyard and brought back to life by two high school students.
Pauly Shore portrays Stoney Brown, one of the high school students who finds the caveman and helps him navigate modern teenage life.
Sean Astin portrays Dave Morgan, the other high school student who, along with Stoney, discovers the caveman and brings him into their world.
Megan Ward plays Robyn Sweeney, a popular girl in high school who becomes interested in the caveman, Link, creating a love triangle.
Robin Tunney portrays Ella, a student who befriends Link and helps him adapt to modern life in high school.
Michael DeLuise plays Matt Wilson, a student who initially befriends Link but then becomes jealous of the attention he receives.
Rose McGowan portrays Nora, a student who is part of the social circle that encounters the caveman in high school.
Erick Avari plays Raji, a store owner who gets caught up in the chaos caused by the caveman's presence in the town.
Michole Briana White portrays Kathleen, a high school student who is intrigued by the appearance of the caveman, Link.
Ke Huy Quan plays Kim, a friend of the main characters who gets involved in the antics surrounding the caveman's arrival.
Patrick Van Horn plays Phil, Matt's Thug #1, a character associated with the high school bullying group who encounters Link.
Dalton James portrays Will, Matt's Thug #2, another member of the high school bullies who interacts with the caveman and the main characters.
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