Before heading to Isla Nublar in Costa Rica, John Hammond, along with Alan and Ellie, picks up mathematician Ian Malcolm and computer systems engineer Dennis Nedry. Don Gennaro, John Hammond's attorney, is already on the plane and has requested that the experts visit the island to evaluate its safety.
Nobody is aware that Dennis Nedry, a computer engineer, has collaborated with Biosyn, a rival bioengineering company, to steal dinosaur embryos. Dennis intends to carry out the crime by cutting off all of the park's power and security systems, including the electric fences that keep the dinosaurs and humans apart.