Matthew, a college freshman, meets his dream girl in a dorm elevator during a blackout. He never sees her face, but instantly falls in love. In the morning, the power is restored, but the "dream girl" has vanished. All Matthew knows is that she lives in an all-girls dorm. He sets out on a semester-long journey to find his mystery girl among a hundred female suspects. Could it be Wendy? Dora? Arlene? Patty? Cynthia? Or the 95 other girls, any of whom could have been in that elevator with Matthew.

On a class excursion to a cave with stone age paintings the clumsy Rex gets lost. A mysterious crystal opens a gateway in time and sets him back to the stone ages, where he meets a group of prehistoric fellows and the gorgeous Eba. While teaching her English and doing some pseudo-research on her fellows, his main goal is to get her sleeping with him. However the curiosity of the clan chief disturbs his attempts.