Four years after the failure of Jurassic Park on Isla Nublar, John Hammond reveals to Ian Malcolm that there was another island ("Site B") on which dinosaurs were bred before being transported to the mainland. Their team reaches the island, they soon discover the presence of another group of people. This new group however are not there for biological data but instead have something more sinister in mind. The two groups confront each other in the face of extreme danger and must team up for their own survival in a race against time.