Rick Marshall and his children Will and Holly were on a weekend expedition rafting trough a river when an enormous earthquake diverts them to an eclectic alien world inhabited by dinosaurs, chimpanzee-like cavemen called Pakuni, and aggressive, humanoid creatures called Sleestak.

Charlie Harrison dreams of being a rock star and, with the help of friends and a gang of local toughs, he arranges a concert in his house for a big time record producer, or at least that is what Charlie thought he was arranging.