Cavegirl

On a high school field trip to an abandoned cave in the California desert, students are warned to stay together because if anyone becomes lost, they may never be found. The students immediately lose Rex, the class geek. Alone in the cave, he's mysteriously transported back in time to when cave men and women roamed the earth. Rex immediately falls for a beautiful cave girl, Iba, and impresses her with his modern powers. Suddenly, he's not a geek anymore and has won the heart of the girl of his dreams. But he's ultimately caught between a rock and a hard place when he's forced to choose between returning to life as a nerd or staying in the distant past...