It's been four years since the genetically bred Jurassic Park dinosaurs terrorized the scientists and visitors who had come to marvel at their existence. But Dr. Ian Malcolm (Jeff Goldblum) has just learned some very disturbing news: John Hammond (Richard Attenborough), the billionaire entrepreneur who funded the original Park, has been breeding more dinosaurs at a second, secret location. What's even more shocking to Dr. Malcolm is learning that his girlfriend, paleontologist Sarah Harding (Julianne Moore), is already at the site, studying the dinosaurs.

Arriving at the island, Dr. Malcolm must not only avoid the dangerous velociraptors and Tyrannosaurus Rex, he must deal with a big game hunter who plans to bag the biggest trophy of his life, and John Hammondís nephew, who plans to transport dinosaurs to the mainland. Is San Diego ready for dinosaurs roaming its streets?