George C. Scott as Dr. Herbert Bock

Diana Rigg as Barbara Drummond

Barnard Hughes as Drummond

Richard Dysart as Dr. Welbeck

Stephen Elliott as Dr. Sundstrom

Donald Harron as Milton Mead

Andrew Duncan as William Mead

Nancy Marchand as Mrs. Christie

Jordan Charney as Hitchcock

Roberts Blossom as Guernsey

Lenny Baker as Dr. Schaefer

Richard Hamilton as Dr. Ronald Casey

Arthur Junaluska as Mr. Blacktree

Kate Harrington as Nurse Dunne

Katherine Helmond as Marilyn Mead

David Hooks as Dr. Einhorn

Frances Sternhagen as Mrs. Cushing

Robert Walden as Dr. Brubaker

William Perlow as Cardiac Arrest Doctor

Bette Henritze as Operating Room Nurse

Rehn Scofield as Dr. Spezio

Dora Weissman as Lady in the Hospital

Carolyn Krigbaum as Dr. Bock's Secretary

Paddy Chayefsky as Opening Narrator (voice) (uncredited)

Robert Anthony as Dr. Elroy Ives (uncredited)

Leigh Beery as Mead's Secretary (uncredited)

Cynthia Belgrave as Nurse Reardon (uncredited)

Norman Berns as Dr. Biegelman (uncredited)

Jacqueline Brookes as Dr. Immelman (uncredited)

Lonnie Burr as Intern (uncredited)

Stockard Channing as E.R. Nurse (uncredited)

Alex Colon as Young Lord (uncredited)

Matthew Cowles as Intern Chandler (uncredited)

Reid Cruickshanks as Chief Engineer (uncredited)

Anita Dangler as Paranoid Lady (uncredited)

Jean David as Stephanie McGuire (uncredited)

Lorrie Davis as Nurse Divine (uncredited)

Dawn Powell Dell as Hospital Visitor (uncredited)

Dennis Dugan as E.R. Doctor (uncredited)

Milton Earl Forrest as Militant Leader (uncredited)

Julie Garfield as Nurse Perez (uncredited)

Richard Goode as Dr. Sutcliffe (uncredited)

Nat Grant as Black Panther (uncredited)

Sarina C. Grant as Nurse X (uncredited)

Christopher Guest as Resident (uncredited)

Nat Horne as Patient (uncredited)

Bette Howard as Young Mother (uncredited)

Tresa Hughes as Mrs. Donovan (uncredited)

Bruce Kornbluth as Young Activist Doctor (uncredited)

Bill Lazarus as Police Captain (uncredited)

Paul Mace as Intern Ambler (uncredited)

Nancy MacKay as Sheilah (uncredited)

Tony Major as Ambulance Attendant (uncredited)

Shawn McAllister as Medical Intern (uncredited)

Joy Nicholson as Sundstrom's Secretary (uncredited)

Bob O'Connell as Policeman (uncredited)

Angie Ortega as Nurse Teresa Campanella (uncredited)

Janet Paul as Emergency Room Receptionist (uncredited)

Lou Polan as Dr. Lagerman (uncredited)

Paul B. Price as Nameless Man (uncredited)

Janet Sarno as Nurse Rivers (uncredited)

Sab Shimono as Operating Room Staff Member (uncredited)

Marilyn Sokol as Lady Lib. (uncredited)

Tom Spratley as Mitgang (uncredited)

John Tremaine as Doctor (uncredited)

Tracey Walter as Man in Crowd (uncredited)

Gena Wheeler as Holding Nurse (uncredited)

Lydia Wilen as Emergency Nurse (uncredited)