Sam Neill Dr. Alan Grant William H. Macy Paul Kirby Téa Leoni Amanda Kirby Alessandro Nivola Billy Brennan Trevor Morgan Erik Kirby Michael Jeter Mr. Udesky John Diehl Cooper Bruce A. Young M.B. Nash Laura Dern Dr. Ellie Sattler Taylor Nichols Mark Degler Mark Harelik Ben Hildebrand Julio Oscar Mechoso Enrique Cardoso Blake Michael Bryan Charlie Sarah Danielle Madison Cheryl Logan Linda Park Hannah Sonia Jackson Symposium Leader Bruce French Science Reporter Bernard Zilinskas Male Student Rona Benson Female Student Frank Clem Man in Suit Craig Hosking Pilot Rick Shuster Pilot Edward C. Gillow University Professor at Symposium (uncredited) Craig Richards Billy's Bar Buddy (uncredited)