 The group is then joined by Hammond 's grandchildren , Lex and Tim Murphy , for a tour of the park , while Hammond oversees the trip from the park 's control room . The tour does not go as planned , with the dinosaurs failing to appear . The group later encounters a sick Triceratops . The tour is cut short as a tropical storm approaches Isla Nublar . Most of the park employees depart on a boat for the mainland and the visitors return to their electric tour vehicles , except Ellie , who stays with the park 's veterinarian to study the Triceratops . 
