Michael Crichton Director, Screenwriter Geneviève Bujold Dr. Susan Wheeler Actor Michael Douglas Dr. Mark Bellows Actor Elizabeth Ashley Mrs. Emerson Actor Rip Torn Dr. George Actor Richard Widmark Dr. Harris Actor Lois Chiles Nancy Greenly Actor Hari Rhodes Dr. Morelind Actor Gary Barton Computer Technician Actor Frank Downing Kelly Actor Richard Doyle Jim Actor Alan Haufrect Dr. Marcus Actor Lance LeGault Vince Actor Michael MacRae Chief Resident Actor Betty McGuire Nurse Actor Tom Selleck Sean Murphy Actor Charles Siebert Dr. Goodman Actor William Wintersole Lab Technician Actor Ernest Anderson First Doctor Actor Harry Basch Second Doctor Actor Maury Cooper Third Doctor Actor Joni Palmer Dance Instructor Actor Joanna Kerns Diane Actor Kay Cole Sally Actor Sarina C. Grant Woman in Elevator Actor Martin Erlichman Producer Victor J. Kemper Cinematographer David Bretherton Film Editing Jerry Goldsmith Original Music Albert Brenner Production Design Rick Simpson Set Decoration Sam Christensen Casting Joyce Robinson Casting