Name: Sarah Harding
Played by: Julianne Moore
Occupation: Paleontologist
Bio: Sarah is Ian Malcolm's girlfriend at the time of The Lost World. She volunteers for the expedition Hammond organizes to Isla Sorna, neglecting to tell Ian of her intentions. She often puts her work in the field ahead of her own safety.

Name: Peter Ludlow
Played by: Arliss Howard
Occupation: InGen CEO
Bio: Peter Ludlow is the nephew of John Hammond. When a little girl is attacked by a dinosaur on Site B, Ludlow takes control of InGen and attempts to bring back the dinosaurs for a new theme park in San Diego.

Name: Roland Tembo
Played by: Pete Postlethwaite
Occupation: InGen CEO
Bio: An experienced hunter, Roland has tracked and killed every dangerous animal imaginable. He is contacted by his friend Ajay, who tells him of a new quest that even he would find intriguing. He travels to Isla Sorna to take down a Tyrannosaurus, the ultimate predator.

Name: Deiter Stark
Played by: Peter Stormare
Occupation: Hunter/Mercenary
Bio: Deiter serves as second in command to Roland. His character is portrayed as a greedy, looter with no respect for nature.

Name: Kelly Malcolm
Played by: Vanessa Lee Chester
Occupation: Student
Bio: Kelly is the curious daughter of Ian Malcolm. She feels that her father is too caught up with his work to spend time with his own children. She hides in the trailer to make the trip to Isla Sorna, a decision she would later regret.

Name: Ajay Sidhu
Played by: Harvey Jason
Occupation: Hunter
Bio: Ajay is Roland's closest friend and fellow hunter. The two adventure to Isla Sorna to take down what they deem to be, the greatest predator.

Name: Robert Burke
Played by: Harvey Jason
Occupation: Paleontologist
Bio: Burke is a paleontologist hired by InGen to serve as an advisor on the expedition to Isla Sorna. His theories about dinosaur behavior leads to frequent conflict with Sarah Harding.

Name: Billy Brennan
Played by: Allesandro Nivola
Occupation: Graduate Student
Bio: Billy is Grant's good friend and assistant. When the Kirby's approach him with an offer to visit Isla Sorna, he is eager to accept. He is very outgoing and can sometimes take great risks for his passions.

Name: Paul Kirby
Played by: William H. Macy
Occupation: Owner of Kirby Paint and Tile Plus
Bio: Paul Kirby is the concerned father of Eric Kirby. When his son is lost on Isla Sorna, Paul goes to extreme measures to get to the island. He lies to Alan Grant and other members of a team he recruits for the rescue mission.

Name: Amanda Kirby
Played by: Téa Leoni
Occupation: Housewife/Unknown
Bio: Amanda is the ex-wife of Paul Kirby. When her son goes missing, she works with Paul Kirby to organize a team to get him back when all attempts for government assistance fails.

Name: Eric Kirby
Played by: Trevor Morgan
Occupation: Student
Bio: Eric is the son of Paul and Amanda Kirby. When a para-sailing accident leaves him stranded on Isla Sorna, he must find a way to survive on his own for 8 weeks.

Name: M.B. Nash
Played by: Bruce A. Young
Occupation: Mercenary
Bio: Nash is hired by Paul Kirby to rescue Eric. He serves as the pilot for the team but crashes after a dinosaur attack.

Name: Mr. Cooper
Played by: John Diehl
Occupation: Mercenary
Bio: Cooper is hired by Paul Kirby as a mercenary for the expedition. However, his weapons prove no match for a nine ton dinosaur.

Name: Mr. Udesky
Played by: Michael Jeter
Occupation: Booking Agent
Bio: Udesky is hired by Paul Kirby. After the crash, he learns that Kirby's checks were faked.

Name: Mark Degler
Played by: Taylor Nichols
Occupation: Foreign Relations Specialist
Bio: Mark is Ellie's husband in Jurassic Park 3. His government job has allowed him many opportunities for networking. He uses his connections to send a rescue team after Grant calls for help.

Name: Ben Hildebrand
Played by: Mark Harelik
Occupation: Unknown
Bio: Amanda's boyfriend at the time of Jurassic Park 3, he and Eric are stranded on Isla Sorna. He dies shortly after landing and leaves Eric alone.