Cast of Jurassic Park III

Sam Neill plays Dr. Alan Grant, a paleontologist who is brought back to Isla Sorna to help find a missing boy.

William H. Macy portrays Paul Kirby, a businessman who hires Dr. Grant to assist in a search and rescue operation.

Téa Leoni plays Amanda Kirby, Paul Kirby's estranged wife, who also participates in the rescue mission.

Alessandro Nivola plays Billy Brennan, a young assistant to Dr. Grant who is eager to prove himself.

Trevor Morgan portrays Erik Kirby, the young boy who goes missing on the island.

Michael Jeter plays Mr. Udesky, a mercenary hired to assist the Kirbys on their journey to rescue Erik.

John Diehl plays Cooper, a member of the rescue team with a skeptical outlook.

Bruce A. Young portrays M.B. Nash, a character involved with the rescue operation.

Laura Dern reprises her role as Dr. Ellie Sattler, a former colleague of Dr. Grant who plays a crucial role in the adventure.

Taylor Nichols plays Mark Degler, a character assisting the Kirbys on their expedition.

Mark Harelik portrays Ben Hildebrand, another character involved in the storyline on the island.

Julio Oscar Mechoso plays Enrique Cardoso, a character linked to the rescue efforts.