Frank Carlson Library

A wealthy entrepreneur secretly creates a theme park featuring living dinosaurs drawn from prehistoric DNA. Before opening the attraction to the public, he invites some scientists to experience the park and help calm anxious investors; but, during the visit, the security system breaks down and prehistoric creatures break out.

On an island off Costa Rica there exists a hush-hush colony of giant animals which attracts the attention of two expeditions. The first one, including children, is led by a paleontologist, the other is made up of evil scientists who want to do experiments. The animals rout both without much concern for their motives.