The last dinosaur died 65 milion years ago, but in 1993 a rich scientist, John Hammond, had an idea. He took the blood from frozen prehistoric mosquitoes, and made new dinosaurs with it. His idea worked and he put the dinosaurs in a zoo on a tropical Hawaiian island - but then things went wrong. One of John Hammond`s scientists - Dennis Nedry - wanted to sell some dinosaur eggs to a friend. Nedry turned off the zoo security system and left the zoo. But the dinosaurs came too...

Lex and Tim Hammond were the grandchildren of scientist John Hammond. In 1993 Lex and Tim had a very strange holiday. They went to visit Their grandfather, John Hammond, on his tropical Hawaiian island. In his zoo they saw some dinosaurs! Then their problems started. One of the dinosaurs - a Tyrannosaurus Rex - escaped from its cage and chased them. They met a dinosaur scientist, Alan Grant, and they all ran through the forest.
Alan, Lex and Tim saw a lot of different dinosaurs in the forest. Some were very dangerous and killed one of the yoo people.