Rick Marshall and his children Will and Holly are on a weekend expedition rafting down a river when an enormous earthquake diverts them to an eclectic alien world inhabited by dinosaurs, chimpanzee-like cavemen called Pakuni, and aggressive, humanoid lizard creatures called Sleestak.
Starring Spencer Milligan, Wesley Eure, Philip Paley, Kathy Coleman, Walker Edmiston, Walker Edmiston, Brooke Bundy, Marvin Miller