Six years after the death of John Hammond and the mysterious destruction of his Jurassic Park island of Isla Nubla, mathematician Ian Malcolm discovers a second island off Costa Rica, where Hammond created his genetically bred dinosaurs. He travels there with a scientific research team including paleobiologist Richard Levine, Sarah Harding, and two stowaway kids, Kelly and Arby, both 11 years old.

Once on the island, they find themselves on the run for their lives from some of the killer dinosaurs with whom Ian has already crossed paths, along with some new killers. The group not only has to contend with the dinosaurs, but with murderous rival scientist Lewis Dodgson and his cronies, who are out to steal the dinosaur eggs for themselves, as well.