Lex and Tim Murphy, who are Hammond's grandkids, join the group. The group goes on a tour of the park in some Ford Explorer cars. A tropical storm heads towards the park, and it starts raining. Ellie is separated from the group when she tries to help a sick "Triceratops". Dennis Nedry, a worker at the park, betrays Hammond so he can get money from another company, and he turns off the park's safety systems. The cars that the group are in aren't able to move anymore.