- Yvette Mimieux - Pat Holmes
- Sam Waterston - Mark
- Dean Stockwell - Dr. Rudy Devereux
- Tim Rooney - Wylie Hamilton
- Victor French - Jack
- Elizabeth Rogers - Miss Trilling
- Rupert Crosse - George Parker
- Diana Muldaur - Jeannie Orloff
- Joan Marshall - Charlene Ross
- Kym Karath - Margaret Hanson
- Virginia Gregg - Grace Temple
- Larry Parks - Dr. Steven Waller
- Tige Andrews - Roy Winters
- William Fawcett - Cox
- Dorothy Malone - Rena Ladovan
- Joby Baker - Jerry House
- Dick York - Harry Benton
- Jason Wingreen - Painter
- Donald Randolph - Dr. John Grosseto
- Susan Strasberg - Barbara Miller
- Ellen Burstyn - Anne Garner
- Edward Platt - Dr. Tom Paulson
- Dorothy Provine - Sally Boles
- Noreen Corcoran - Nurse Mary Thompson
- Michael Evans - Charles LeFevre
- Pippa Scott - Dr. Elizabeth Cullus
- Cliff Norton - Joe Gatson
- Margaret O'Brien - Nurse Lori Palmer
- Joseph Schildkraut - Dr. Maxwell Keller
- Bill Mumy - Jeffey
- Joan Hackett - Karen Welby
- Alex Nicol - David Graham
- Steven Geray - Frank Chernak
- Bert Remsen - Dr. Tom Belmanno
- Dean Jagger - Lt. Gen. John Sparrow
- Joanne Linville - Elizabeth Thornley
- Colleen Dewhurst - Eleanor Markham
- Otto Kruger - Louis Conrad
- Abraham Sofaer - Shahzi Saund
- Mike Kellin - Dr. Larry Phelen
- Betty Bronson - Wilma McHenry
- Steven Hill - Dr. Chandra Ramid
- Joan Freeman - Ellen Hall
- Roger Davis - Karl Bjorstrand
- Olympia Dukakis - Anna Nieves
- Jackie Joseph - Ellie
- George Macready - Harper Faring
- Constance Ford - Reba Guy
- James Caan - Charley Johnson
- Gloria Swanson - Julia Colton
- Robert Strauss - Mike Martin
- Aki Aleong - Dr. King
- Jean Hagen - Nurse Mary Ogilvy
- Martine Bartlett - Mrs. Goodwin
- Anna Lee - Mrs. Frances Alland
- Mary Murphy - Janet Logan
- Greg Morris - Lincoln Ball
- William Demarest - Mr. Aimes
- Kathryn Hays - Gina Beemis
- Lois Smith - Libby Clayton
- Thomas Gomez - Truxton Bramley
- Bob Denver - Dr. Paul Garrett
- Glenda Farrell - Vera Dennis
- Miyoshi Umeki - Hana Shigera
- Molly Picon - Ida Forman
- Ralph Bellamy - Dr. L Richard Starke
- Barbara McNair - Mareema Kamba
- Danielle De Metz - Nurse Danielle Mercier
- Frank Overton - John Oliver
- Patricia Breslin - Marion French
- Jack Lord - Dr. Frank Michaels
- Walter Pidgeon - Dr. Charles Priest
- Gena Rowlands - Helen Scott
- Lee Philips - Dr. Arthur Colby
- Diana Van der Vlis - Virginia Martin
- Roberto Contreras - Santos Esqueda
- Robert Walker Jr. - Neal Tomlinson
- Edith Atwater - Miss Thorton
- Douglas Fairbanks Jr. - Dr. Robert Devlin
- George Savalas - Aristos
- Beverly Adams - Student Nurse (uncredited)
- Lana Wood - Judy Gaer
- Suzy Parker - Serena Norcross
- Josephine Hutchinson - Amelia Blair
- Ned Glass - Nate Martin
- Walter Burke - Hotel Clerk
- Stanley Clements - Mr. Riccio
- Paul Stewart - Dr. Giuseppe Muretelli
- Dick Wessel - Sam Dlugash
- Robert Young - Dr. Gilbert Winfield
- Stuart Erwin - Dave Lesser
- Frank Puglia - Joe Crosetti
- Barbara Bel Geddes - Dr. Ruth Halliman
- Peter Brocco - Druggist
- Earl Holliman - Capt. Bob Hill
- Hazel Court - Norma Hobart
- Tippy Walker - Lois Gibbon
- Elizabeth Allen - Katherine West
- Madge Blake - Nurse Helen Phipps
- Tony Bill - Thomas Hartwood
- Morgan Brittany - Harriet Kirsh
- Donna Loren - Anna Perrona
- James Flavin - John Dolan
- Kim Hunter - Emily Field
- Charla Doherty - Kathy Calvert
- Alan Reed - Joe Belasco
- Susan Silo - Angie
- Barbara Young - Saleslady
- Lawrence Montaigne - Raymond Rossi
- Harry Townes - Gerald Prince
- Jack Weston - Dr. Justin Muntag
- Ted Knight - Henryk
- Alex Gerry - Arthur Agurski
- Anne Francis - Kathy Stebbins
- Irene Dailey - Sara Anderson
- Gloria Talbott - Jerry Cunningham
- Linda Watkins - Mrs. Keeler
- Pamela Duncan - Dorothy
- Jean Stapleton - Nurse Whitney
- Beatrice Straight - Pamela Rainey
- Barry Gordon - Billy Hoffman
- Dick Foran - Paul Adams
- Kathy Garver - Tracey Richards
- Joseph Cotten - Charles Ladovan
- Dina Merrill - Evelyn LeFevre
- Jeremy Slate - Dr. Anthony Tredman
- Arte Johnson - Bud Fowler
- Walter Brooke - William Fredericks
- Scott Marlowe - Dr. Eddie Moore
- Hope Summers - Madge
- Joe Mantell - Theodore Roosevelt Hopkins
- Cyril Ritchard - Justin Fitzgibbons
- Glynis Johns - Sister Brigid Marie
- Cliff Osmond - Robert Slade
- Lauren Bacall - Virginia Herson
- Philip Abbott - Dr. David Key
- George Voskovec - Dr. Charles Hodiak
- Robert Winston - Army Corporal
- Donnelly Rhodes - Chris McKenna
- Robert Redford - Mark Hadley
- Gina Gillespie - Little Girl
- Carolyn Jones - Evy Schaller
- Harry Guardino - Gerald Hastings
- Inga Swenson - Paula Waller
- Richard Davalos - Gordon Hall
- Henry Beckman - Sam Allen
- Robert Warwick - Dr. Bromley
- Betty Field - Mrs. Harper
- Peter Haskell - Paul Williams
- Alberta Nelson - Dr. Ruth Carrison
- Fritz Weaver - Arthur Hobler
- James Franciscus - Stan Fisher
- Iphigenie Castiglioni - Mrs. Krolik
- Mary Badham - Cora Sue Henty
- Vito Scotti - Jesus Munoz
- Moyna MacGill - Neighbor
- Stefan Gierasch - Willie Kovar
- Ed Asner - Dr. Frank Williams
- Sue Randall - Emily Gunderson
- Al Ruscio - Ed Rutherford
- Forrest Tucker - Max Beemis
- Richard Anderson - Dr. Norman Phelps
- Rhys Williams - Dr. Chester Wayne
- Barbara Eden - Nurse Judy Gail
- Darryl Hickman - Harlan Thomas
- Nancy Malone - Nurse Jean Dennis
- James Shigeta - Dr. Roy Shigera
- Marta Kristen - Darleen Landon
- Ed Nelson - Dr. Keith Judge
- Anne Helm - Helen Keening
- Marion Ross - Nurse Ann Patterson
- Carl Benton Reid - Dr. George Garrison
- Cesar Romero - Dr. Paul Marino
- Ann Harding - Mae Priest
- Murray Hamilton - Lt. Dan Hargrave
- Murray Hamilton - Dr. Haldore Mattern
- Peg La Centra - Loretta Anderson
- Brooke Bundy - Linda Robbins
- George Grizzard - Douglas Martin
- Sal Mineo - Carlos Mendoza
- Michael Callan - Charles Devereaux
- Jon Lormer - Mr. Teale
- Kelly Corcoran - Hubby Kimball
- Terry Carter - Ernie Mann
- Jack Warden - Ernie Duffy
- Gerald S. O'Loughlin - Gus Pochek
- Joan Blondell - Dolly Marlowe
- Lisa Loring - Cindy Norcross
- Estelle Winwood - Adeline Blair
- Eddie Firestone - Joe Fitch
- Geraldine Brooks - Laura Bailey
- Donald Harron - Dr. Ian MacDuff
- John Qualen - Mr. Callahan
- Peter Duryea - Larry
- Larry Blyden - Eddie Hiller
- Connie Gilchrist - Mary Markham
- Angie Dickinson - Carol Tredman
- Malcolm Atterbury - Asa McConnell
- Curt Conway - Judge Reynolds
- Herschel Bernardi - Pico
- Herschel Bernardi - Nathan Agurski
- Francis X. Bushman - Mr. Cooper
- James Mason - Dr. Maxwell Becker
- Darren McGavin - Prof. Felix Holman
- Diana Sands - Irene Rush
- Beverly Garland - Julia Dressard
- Beverly Garland - Susan Hastings
- James Earl Jones - Dr. Lou Rush
- Gertrude Flynn - Eleanor Quayle
- Gertrude Flynn - Technician
- Sandy Kenyon - Dr. William Galdi
- John Newland - Paul Montgomery
- Leonard Stone - Fred Payson
- Charles McGraw - Dr. Kenneth Hasker
- Charles McGraw - Fred Rainey
- Bernard Kates - Irving Forman
- Bernard Kates - TV Director
- Clegg Hoyt - Mac
- Whit Bissell - Dr. Kenneth Kline
- James Daly - Morgan Bannion
- Ivan Dixon - Dr. Arthur Staples
- Ivan Dixon - Detective
- Pat Crowley - Janet Parker
- Pat Crowley - Claire Sutton
- Corey Allen - Dr. Harris
- Corey Allen - Jerome Pine
- Janice Rule - Lila Gregg
- Janice Rule - Joan Cartwright
- Jeff Donnell - Evelyn Driscoll
- Kim Darby - Sandy Kimball
- Kim Darby - Patsy Carey
- Mona Bruns - Landlady
- James Anderson - Spencer
- Lee Marvin - Dr. Paul Probeck
- Lee Marvin - Buddy Bishop
- Jan Murray - Kenny Hallerton
- Fay Spain - Sally Winters
- Fay Spain - Emily Buchanan
- Anne Meacham - Rose Clayton
- Lois Nettleton - Hildy Pochek
- Lois Nettleton - Lisa Dowling
- Noah Keen - Dr. Leland Laughlin
- Peter Helm - Tommy Rainey
- Richard Kiley - Fred Carroll
- Diana Hyland - Marguerite Williams
- Diana Hyland - Dr. Lilith McGraw
- John Hoyt - Dr. Bernard Motley
- Marge Redmond - Clara McCloskey
- Marge Redmond - Mrs. Barnett
- Victor Jory - Dr. Oscar Whalen
- George Mathews - Dr. Willard Ryson
- Alfred Ryder - Dr. Tony Stewart
- Barbara Parkins - Annie Grant
- Carroll O'Connor - Roy Drummond
- Carroll O'Connor - David Burnside
- Jack Albertson - Cary Fain
- David Sheiner - Fred Hunter
- Paul Carr - John Doe
- Kevin McCarthy - Dr. Harvey Gruboldt
- Kevin McCarthy - Dr. Omar Larson
- S. John Launer - Dr. Sadvary
- John Ashley - Mitch
- Jack Donner - Dr. John Shea
- Michael Constantine - Dr. Ernest Miller
- Stanley Adams - Dr. Alexander Shoates
- Bert Freed - Director
- Bert Freed - Dr. Donald White
- Eddy Waller - Dr. Millard Eakins
- Theodore Bikel - Dr. Mahmel Homatka
- Ellen Corby - Ainsley Hallie
- Leslie Nielsen - Walter Burton
- Leslie Nielsen - Harry Kleber
- Henderson Forsythe - Dr. Stephen Kildare
- Lola Albright - Gertrude Carey
- Charles Macaulay - Jameson Black
- Richard Eyer - Bob Eckert
- John Williams - Dr. George Hazard
- Mariette Hartley - Ellen Hendricks
- Barbara Barrie - Peggy Farrow
- Henry Silva - Ed Carson
- Betsy Jones-Moreland - Ruth Jonah
- Joe De Santis - Bruno Rossi
- Joe De Santis - Enrico Conti
- Polly Bergen - Janice Graham / Cathy Brandon
- Claudine Longet - Mme. Dupres
- Brian Keith - Alfred Freely
- Clancy Cooper - Dunleavy
- Clancy Cooper - Janitor
- Leonard Nimoy - Harry
- Paul Mantee - Neurosurgeon
- Steve Ihnat - Dr. James Rothson
- Conlan Carter - Intern (uncredited)
- James Whitmore - Henry Clay Kincaid
- Johnny Washbrook - Tommy Dennis
- Mary Astor - Martha Lantzinge
- Mary Astor - Aunt Frances
- Collin Wilcox Paxton - Winona Pine
- Collin Wilcox Paxton - Lorena Henty
- Beulah Quo - Natsu Shigera
- Jack Ging - Dr. Paul Graham
- Walter Slezak - Dr. Max Jurgens
- Bill Bixby - Dr. John Grant
- Bill Bixby - Dr. Ben Mollenhour
- Harry Ellerbe - Dr. Gary Dawson
- Adam Williams - Ralph Walker
- Frank Aletter - Dr. Jerry Helvick
- Marianna Hill - Gina Craig
- Joyce Van Patten - Julie Belmanno
- Joyce Van Patten - Ruth Scully
- Allan Hunt - Rusty
- Patience Cleveland - Nurse Rowe
- Patience Cleveland - Nurse Jackie Barnett
- Dennis Patrick - Franklin V. Powers
- Leonid Kinskey - Sam Weiss
- Cheryl Holdridge - Nurse Nancy Reynolds
- Anne Baxter - Nora Willis
- Kyle Johnson - Davey Mann
- Paul Comi - Dr. Thomas Kane
- Jeanette Nolan - Fanny Devalon
- Jeanette Nolan - Annie
- Chester Morris - Tom Monahan
- Peter Whitney - Carl Temple
- Peter Whitney - Dr. Nat Franklin
- Jules Munshin - Sylvan Pappinax
- Patricia Smith - Norma Jasper
- Ron Howard - Jerry Prentice
- Vic Perrin - Veterinarian
- Mercedes McCambridge - Sister Teresa
- Tisha Sterling - Sheila Winfield
- Harry Basch - Dr. Milton Bremner
- Ben Wright - Mr. Baker
- Ben Wright - Dr. Van Zandt
- Joanna Barnes - Dr. Suzanne Shary
- Tom Bosley - Harry Markham
- Ted Eccles - Dilmore McConnell
- Phyllis Love - Ruth Wandemeir
- Shelley Morrison - Mrs. Martinez
- Shelley Morrison - Mrs. Ruiz
- Robert Reed - Judd Morrison
- Laura Devon - Sister Benjamin
- Robert Culp - Matt Hendricks
- Robert Culp - Dr. Jesse Hartwood
- Lesley Ann Warren - Bonda Jo Weaver
- Dan Tobin - Jonsey
- Hayden Rorke - Bishop
- Hayden Rorke - Dr. Norman Hackett
- Anjanette Comer - Carol Montgomery
- Barbara Rush - Madge Bannion
- Suzanne Pleshette - Julie Lawler
- Suzanne Pleshette - Nurse Cathy Benjamin
- Suzanne Pleshette - Ellen Tracey Adams
- David Opatoshu - Fred Kirsh
- Eduardo Ciannelli - Pappas
- Eduardo Ciannelli - Angelo Delvecchio
- Basil Rathbone - Frederick Foray
- Beah Richards - Alice
- Joanna Pettet - Yvonne Barlow
- Eileen Heckart - Nurse Jenny Freesmith
- Peter Falk - Dr. Matt Gunderson
- Edward Andrews - Arthur Penmore
- Walter Matthau - Franklin Gaer
- Robert B. Williams - Louis Parker
- William Schallert - Inspector
- William Schallert - Tom Scola
- Dick Sargent - Dr. Paul Willis
- Barbara Baxley - Kitty Scola
- Fay Bainter - Sister Mike
- Charles Aidman - James Grady
- Jack Carter - Willie Guy
- Jack Carter - Ted Galahad
- Julie Adams - Ginny Nelson
- Elizabeth MacRae - Nurse Carrie Palmer
- Stuart Nisbet - Mr. Garst
- Alexander Lockwood - Harold Lee
- Ruth McDevitt - Nurse Adele Fromm
- John Marley - Dr. Xavier Miller MD
- John Marley - Judge Haines
- Peter Hansen - Mr. Sloan
- Ross Martin - Dr. Bill Mitchell
- Ross Martin - Oscar Clayton
- John Cassavetes - Makin Saund
- Richard Benjamin - Dr. Adam Barstow
- Richard Benjamin - Intern
- Norman Alden - Bernie (uncredited)
- Phyllis Hill - Mrs. Holmes
- Phyllis Hill - Mrs. Beaton
- Peggy Wood - Katie Harris
- Nina Foch - Georgia Pettigrew
- Tom Tryon - Dr. William Ellis
- Ross Elliott - Asst. District Attorney
- Hans Conried - Oliver Blair
- Anne Jeffreys - Jill Sloan
- Patrick O'Neal - Dr. Harvey Robert Jones
- Eli Mintz - Sam Stone
- Carol Eve Rossen - Dr. Lois Bower
- Carol Eve Rossen - Dr. Emmy Lorfield
- Charles Bronson - Harry Gregg
- Susan Bay Nimoy - Nurse Leah Bradley
- Ruth White - Hester Cullen
- Joe Maross - Nicky Buchanan
- Burt Mustin - Mr. Franklin
- Burt Mustin - Dibbedee
- Charles Lampkin - Eddie
- Crahan Denton - Fred Dennis
- Parley Baer - Dr. James Connors
- Michael Forest - Julian Forman
- Jocelyn Brando - Doris Phillips
- Eddie Albert - Dr. Norman French
- Mala Powers - Julie Michaels
- Robert Sorrells - Big Green
- Audrey Dalton - Jo Grant
- Sorrell Booke - MacAllister Thane
- Sorrell Booke - Julius Orloff
- Beau Bridges - Bob Colby
- Paul Burke - Lawrence Crane
- John Fiedler - Father Hughes
- John Fiedler - D.V. Dromley
- John Fiedler - Mr. Calhoun
- Ford Rainey - Dr. Walter Untermeyer
- Ford Rainey - Dr. Andy Meadows
- Yvonne Craig - Carol Devon
- Les Tremayne - Dr. Keith Bresson
- Les Tremayne - Dr. Arthur Jansen
- Leigh Chapman - Miss Adams
- Robert Random - Eddy York
- Alida Valli - Luisa Brabante
- Sandra Gould - Mrs. Gentry
- Louise Sorel - Eloisa Ruiz
- Andrew Prine - Dr. Roger Helvick
- Andrew Prine - John Bardeman
- Andrew Prine - Dr. Louis Miller
- Burt Brinckerhoff - Charles Shannon
- Burt Brinckerhoff - Vincent Doyle
- Mabel Albertson - Hannah Lacey
- Rusty Lane - Gus Markham
- Lester Dorr - Mr. Benson
- Edmon Ryan - Mr. Hallerton
- Edmon Ryan - Bill Revere
- Rosemary DeCamp - Angela Faring
- Frank Maxwell - Vincent Thompson
- Sharon Farrell - Rachel Field
- Sharon Farrell - Glenda Hester
- Sharon Farrell - Jeanne Sawyer
- Jack Hawkins - Justin Post
- Ricardo Montalban - Damon West
- Richard Beymer - Rev. Jack Elder
- Clu Gulager - Dr. Norman Gage
- Susan Oliver - Dr. Jessie Martel
- Susan Oliver - Carol Logan
- Robert Karnes - Harry Buford
- Robert Karnes - Monte
- Miriam Colon - Rani Stewart
- Miriam Colon - Pila
- Diane Baker - Amy Post
- Diane Baker - Emma Swader
- Anne Seymour - Mrs. Canford
- Zohra Lampert - Rose Kemmer
- Zohra Lampert - Myra Krolik
- Frances Reid - Emmy Foray
- Helen Kleeb - Nurse Bernard
- Nora Marlowe - Mrs. Smith (uncredited)
- Nora Marlowe - Mamie Delaney
- Michael McGreevey - Tommy Adams
- Peggy Rea - Dorothy Gitner
- Peggy Rea - Nurse Helen O'Hara
- Peggy Rea - Nurse Carrie
- Stafford Repp - Eddie Boykin
- Edgar Buchanan - Judge Wilfred Manning
- Edgar Buchanan - Steve Devitt
- Sidney Blackmer - Dr. Carleton Lantzinge
- Sidney Blackmer - Dr. Andrew Bennett
- Dan O'Herlihy - Dr. Phillip Downey
- Dan O'Herlihy - Mark Sloan
- Dan O'Herlihy - John Patrick McHenry
- Dan O'Herlihy - Mark Addison
- Lloyd Bochner - Dr. Harry Nelson
- John Anderson - Vernon Hackett
- Mario Alcalde - Luis Nieves
- Pat Hingle - Lloyd Jason
- Pat Hingle - Dr. Edward Swader
- Grandon Rhodes - Dr. Evans
- Paul Newlan - Carl Victor
- James Griffith - Harold Hutchinson
- James Griffith - Sims
- Fred Holliday - John Tremont
- Dabney Coleman - Dr. David Kirkson
- J. Pat O'Malley - John Doe IV
- J. Pat O'Malley - Paul Menzies
- Irene Tedrow - June Crowley
- John Larch - Dr. Victor Jonah
- James T. Callahan - Dr. Yates Atkinson
- Elinor Donahue - Sharon Calloway
- Joseph V. Perry - Antonio Pronesti
- Lillian Bronson - Frances Neilson
- Tommy Farrell - Wally
- Garry Walberg - Dr. Benjamin Lenlow
- Isobel Elsom - Mrs. Walker
- Isobel Elsom - Mrs. Silver
- Lurene Tuttle - Mrs. Parker
- Tony Dow - Bob Quincy
- Ruth Roman - Marie Quincy
- Ruth Roman - Lily Prentice
- Denver Pyle - R. E. Lenger
- Claude Rains - Edward Fredericks
- Ken Mayer - Maitre d'
- Milton Frome - Walter Goodman
- Ramon Novarro - Gasparo Paolini
- Maidie Norman - Mrs. Johnson
- Dennis Weaver - Wayne Wandemeir
- Philip Bourneuf - Dr. Wickens
- Philip Bourneuf - George Prentiss
- Lee Meriwether - Nurse Bonnie Tynes
- Lee Meriwether - Nurse Harper
- Lee Meriwether - Nurse Adams
- Lee Meriwether - Nurse Angela Springer
- Fred Astaire - Joe Quinlan
- Roger Mobley - Jamie Carroll
- Roger Mobley - Alan Burnside
- Bruce Hyde - Dr. Jeff Brenner
- Rip Torn - Dr. Nicholas Keefe
- Bill Walker - Tad
- Naomi Stevens - Mrs. Gast
- Naomi Stevens - Aunt Kasia
- Naomi Stevens - Mrs. Gitlin
- Naomi Stevens - Mrs. Mendoza
- Lew Gallo - Dr. Ned Rand
- Lew Gallo - Dr. Philip Leland
- Regis Toomey - Arthur Wheeler
- William Shatner - Dr. Carl Noyes
- William Shatner - Dr. Toby Cunningham
- Raymond Bailey - Dr. Jerry Wagner
- Paul Langton - Dr. Ian Lamb
- David Lewis - Dr. Robert Coneely
- Irene Hervey - Martha Kildare
- Claire Trevor - Nurse Veronica Johnson
- Andrew Duggan - Carl Quincy
- Jeanne Cooper - Marian Colby
- Daniela Bianchi - Francesca Paolini
- Max Showalter - Rulon Murphy
- Max Showalter - Ben Ballard
- James Frawley - Luther Bernstein
- Orville Sherman - Steward
- Connie Sawyer - Gladys
- Audrey Totter - Ella Vitnack
- Audrey Totter - Norma Littell
- Patricia Huston - Marie Hackett
- Fabrizio Mioni - Armando di Corragio
- Cloris Leachman - Rhoda Kirsh
- Harry Morgan - Francis X. Healy
- Karl Swenson - Judge
- Marlyn Mason - Laura Morrison
- Conrad Nagel - Governor Matthew Evans
- Harold Gould - Earl McCloskey
- Harold Gould - Dr. Peter Duey
- William Swan - Young Doctor
- Jerry Ayres - Phil
- Karl Weber - Dr. E. David Golden
- Bradford Dillman - Andrew Webb
- Bradford Dillman - Rev. Andrew Webb
- Bradford Dillman - Tony Warren
- Ed Begley - Joe Hogan
- Ed Begley - Henry Harris
- Ed Begley - Jamie Cousins
- Bill Quinn - Instructor
- Bill Quinn - Mr. O'Connor
- George Kennedy - Joe Cramer
- George Kennedy - Sergeant Hensley
- Norman Fell - Arnold Vitnack
- Norman Fell - Dr. Keith Mayes
- Edward Binns - Peter De Gravio
- Edward Binns - Ben Laney
- Martin Balsam - Dr. Milton Orloff
- Martin Balsam - Dr. Carl Noyes
- Martin Balsam - Benny Orloff
- Martin Balsam - Ned Lacey
- Paulene Myers - Technician
- Paulene Myers - X-Ray Technician
- Paulene Myers - Dr. Jean Sackley
- Joyce Bulifant - Judy Cannon
- Chris Hughes - Jerry Tucker
- Irv Pearlberg
- Henry Colman
- Douglas Benton
- Herbert Hirschman
- Norman Felton
- Robert F. O'Neill
Naomi Stevens interpreta a Mrs. Gast en la serie.
Ricardo Montalban interpreta a Damon West en la serie.
Cesar Romero interpreta a Dr. Paul Marino en la serie.
Peter Falk interpreta a Dr. Matt Gunderson en la serie.
James Caan hace el papel de Charley Johnson.
Claude Rains interpreta a Edward Fredericks en la serie.
James Griffith interpreta a Harold Hutchinson en la serie.
John Qualen interpreta a Mr. Callahan en la serie.
Leonid Kinskey hace el papel de Sam Weiss.
Robert Redford hace el papel de Mark Hadley.
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