Sam Neill (Dr. Alan Grant), William H. Macy (Paul Kirby), Téa Leoni (Amanda Kirby), Alessandro Nivola (Billy Brennan), Laura Dern (Dr. Ellie Sattler), Trevor Morgan (Eric Kirby), Michael Jeter (Mr. Udesky), Linda Park (Hannah), Bruce A. Young (M.B. Nash), John Diehl (Cooper), Sarah Danielle Madison (Cheryl Logan), Julio Oscar Mechoso (Enrique Cardoso), Taylor Nichols (Mark), Mark Harelik (Ben Hildebrand), Blake Michael Bryan (Charlie), Sonia Jackson (Symposiumsleiterin), Bruce French (Wissenschaftsreporter), Bernard Zilinskas (Student), Rona Benson (Studentin), Frank Clem (Mann im Anzug)