- Directors: Joe Johnston
- Producers: Larry J Franco, Kathleen Kennedy, Steven Spielberg
- Writers: Michael Crichton, Peter Buchman, Alexander Payne, Jim Taylor
- Genres: Action, Adventure, Sci-Fi, Thriller
- Actors: Sam Neill, William H Macy, Tea Leoni, Alessandro Nivola, Trevor Morgan, Michael Jeter, Laura Dern
Four years after the events of the second film, The Lost World, doctors Alan Grant (Sam Neill) and Ellie Sattler (Laura Dern) have continued their paleontological careers but are working independently, Ellie is married and has two children and Grant is still digging with his protÃ©gÃ©, Billy Brennan (Alessandro Nivola). He is approached by Paul (William H. Macy) and Amanda Kirby (TÃ©a Leoni), who say they are wealthy thrill-seekers who want Grant to give them a tour of Isla Sorna. Grant is reluctant at first, but he eventually agrees after the Kirbys promise to fund his dig.
Grant suspects that something is not quite right when the plane carrying him, Billy, the Kirbys, and some mercenaries, lands. After Amanda uses a megaphone to try to call out to her son in the jungle, they are attacked by a Spinosaurus. As they attempt to escape in the plane, they accidentally fly into the Spinosaurus and go down, fly through the forest and break apart when the Beechcraft Super King Air hits the trees. After being again attacked, the plane falls to the ground, resulting in the death of Nash (Bruce A. Young) and Cooper (John Diehl) (when the plane hit the Dinosuar), and stranding them on the island. The group then run into a Tyrannosaurus, which follows them into the forest. They soon run into the Spinosaurus again, and two predators engage in battle, with the Spinosaurus emerging victorious, twisting the Tyrannosaur’s neck. Grant learns that the Kirbys are actually searching for their son, Eric (Trevor Morgan), who was stranded on the island along with family friend, Ben Hilderbrand, in a parasailing accident. He decides to lead them to the coast, increasing their chances of getting rescued. Along the way, they discover the parasail as well as Ben’s skeletal remains. Billy salvages the parasail, and the Kirbys discover several nearby Velociraptor nests.
The group is close to the shore when the raptors reappear, wanting their eggs back. Grant manages to alleviate the situation by imitating a Velociraptor call for help, which almost causes some of the raptors to attack in order to silence him. Suddenly, a helicopter can be heard overhead. The eggs are given back to the raptors, and they retreat. The group arrives at the beach to see a United States Marine Corps detachment sent by Ellie’s diplomat husband. As they board a helicopter, Grant finds Billy, who was injured during the Pteranodon attack but is still alive. As the helicopter flies off, the survivors see three Pteranodons flying off into the distance. Eric asks Grant where they might be going, and Grant speculates that they are searching for new nesting grounds.