- Gene Barry - Glenn Howard
- Gene Barry - Glenn Howard / Will Manning
- William Shatner - Peter
- JoAnna Cameron - Carole Crown
- Peter Falk - Lewis Corbett
- Orson Welles - Narrator
- Robert Webber - William McKendricks
- Claudine Longet - Lianne Jevret
- Jeanne Crain - Mrs. McKendricks
- John Payne - Russ (FBI Agent)
- Zsa Zsa Gabor - Mira Retzyk
- Joan Hackett - Jean Thorndyke
- Ruth Roman - Bea Decker
- Joseph Campanella - Charles Thorndyke
- Victor Jory - Victor Foss
- Burl Ives - Arthur Jellicoe
- Dana Elcar - Hood
- Bradford Dillman - Earl Keith
- Paul Mantee - Father Minetti
- Lois Nettleton - Ruth Prochek
- Laraine Day - Grace Jellicoe
- Alan Oppenheimer - Harvey
- John Saxon - Peter Max
- Nina Foch - Angela Morgan
- Paul Lukas - Baron Vincennes
- Robert Loggia - Arnold
- Don Gordon - Art Panadero
- Senta Berger - Mariette Bern
- Martin Balsam - Herb Witmer
- Noah Keen - Bob Miley
- Troy Donahue - Norman Hoak
- Julie Sommars - Barbara Ellis
- John Agar - Bert Walker
- Laraine Stephens - Lorraine Farrell
- Josephine Hutchinson - Millie Farrell
- Cloris Leachman - Vera Walker
- Shannon Farnon - Phyllis Hoak
- Victoria Paige Meyerink - Nancy Farrell
- Kevin McCarthy - Carter Haines
- Geraldine Brooks - Evelyn Smith
- John van Dreelen - Deist
- Juliet Prowse - Aja Fowler
- Gary Collins - Sheriff Beal
- Gypsy Rose Lee - Rosetta Stewart
- Simon Scott - Harbald
- Ed Begley - Gabe Sobel
- Kathie Browne - Vicky
- Cesare Danova - Alfieri
- Louis Jourdan - Mario Lompardi
- Harvey Lembeck - Jack Stephens
- Dana Wynter - Countess Lompardi
- Robert Young - Herman Allison
- Ralph Meeker - Senator Goddard
- Glenda Farrell - Woman
- Suzanne Pleshette - Geneva Rogers
- Farley Granger - Hoagland Walters
- Sean Garrison - Buck Hambleton
- Lloyd Bochner - Tom Ramsey
- Martha Hyer - Billie Ramsey
- Ricardo Montalban - Bernard Torres
- Ken Renard - William
- Adrienne Marden - Judge Davidson
- Lloyd Kino - Coroner
- Jean-Pierre Aumont - Emilio Fazio
- Pete Duel - Andrei Chernin
- Bethel Leslie - Miss Haggblad
- Susan Oliver - Tatiana Czaleynokis
- Boris Karloff - Mikhail Orlov
- Richard Jaeckel - Malchek
- Louise Sorel - Marie Fazio
- Lilia Skala - Madame Orlov
- June Allyson - Joanne Robins
- Scott Brady - Marty Lench
- Kevin Coughlin - Sonny
- Veronica Cartwright - Nancy Robins
- Ed Peck - Charles Stein
- Raymond St. Jacques - Ross Cutler
- Herb Jeffries - W.B. Keys
- Abbey Lincoln - Claudia Lee
- D'Urville Martin - Carlton
- Albert Popwell - Chagga
- Susan Strasberg - Cheryl Bridges
- Jeff Morrow - Dr. Wallace
- Jeff Morrow - Malcolm Parks
- Andrew Prine - Jigger
- Nancy Ames - Louise Hahn
- Don Stroud - Lincoln Bridges
- Jack Klugman - Frank Dovnik
- Jack Klugman - Art Trager
- Mel Tormé - Mort Binder
- Harry Dean Stanton - Joe Joe
- Richard Van Vleet - Hal Martin
- Clive Clerk - Tino Torres
- Ivan Dixon - John X. Lee
- Ivan Dixon - Conway Walker
- Harry Guardino - Raul Oliva
- Simon Oakland - Luis Fierro
- Robert Lansing - Fred Martin
- Ann Blyth - Kay Martin
- Nancy Kovack - Linda Mathews
- Fritz Weaver - Walter Scharz
- Gia Scala - Renata Marino
- Ray Danton - Pietro Bertelli
- Gene Evans - Ernest Maxwell
- Jason Wingreen - District Attorney Hammond
- Jason Wingreen - Hammond
- Richard Webb - Warren Travis
- Steve Ihnat - Ralph Hoak
- Steve Ihnat - Captain Oliver
- Vera Miles - Marisa Cummings
- Vera Miles - Tracy Cannon
- Dina Merrill - Nancy Devlin
- Larry D. Mann - Max Korbell
- Jordan Christopher - Bruce Roxton
- Bo Svenson - G.B. Mosbie
- Jackie DeShannon - Leora
- Larry Storch - Norman Turley
- Larry Storch - James Kelso
- Dane Clark - Bill Oliver
- Dane Clark - Brian Smith
- Paul Fix - Old Bob
- Paul Fix - Judge O'Connor
- Grace Lee Whitney - Suzette
- Donald Sutherland - Jerry Trevor
- Tisha Sterling - Alice Ward
- Tisha Sterling - Niobe Redsmith
- Paul Winfield - Barada
- Robert Goulet - Claude Evenhauer
- Carol Lawrence - Janice Ridgely
- David Brian - Elton Wakefield
- Harold J. Stone - Harry Mudd
- Jack Carter - Ernie Cori
- Jack Carter - Bill Crail
- Pierre Jalbert - Dr. Nieves
- Brandon De Wilde - Bobby Currier
- Julie Harris - Verna Ward
- Lonny Chapman - Ralph Currier
- Stephen McNally - Ed Brock
- Stephen McNally - Albert Lang
- Stanley Adams - Mr. Stephens
- Estelle Winwood - Hester Collins
- Estelle Winwood - Henrietta Tate
- Burr DeBenning - Harry Ward
- Anne Helm - Maria Ward
- Whit Bissell - Donald Merrick
- Whit Bissell - Wainwright
- Edmond O'Brien - John Bergman
- Edward Andrews - Milton Spencer
- Severn Darden - Cameron
- Felice Orlandi - Angelito Fidel
- Sidney Blackmer - Roman Stepanak
- Sidney Blackmer - Clarence Dunhill
- Paul Stewart - Dr. Rubias
- Louise Latham - Helen Bigelow
- Regis Cordic - Chairman Walt
- Michael C. Gwynne - Dr. Parker
- Gloria Manon - Dr. Arnold
- Anne Baxter - Betty-Jean Currier
- Anne Baxter - Magda Blain
- Anne Baxter - Magda Blaine
- Stuart Nisbet - Dr. Simmons
- Geoffrey Lewis - Bates
- Jay C. Flippen - Zack Witten
- Jay C. Flippen - Grover
- Joan Crawford - Committee Member (uncredited)
- Shirley Jones - Jackie Harding
- Roscoe Lee Browne - Wamumba
- Alan Caillou - Graham
- Ossie Davis - Kubani
- Jonathan Hole - Victor Masters
- Craig Huebing - Russo
- Janet MacLachlan - Nicole
- John Marley - Frank Chaney
- James McEachin - Jackson
- James McEachin - Henderson
- Van Johnson - Sullivan
- Van Johnson - Jack Newell
- Frank Marth - Carl Lund
- Barry Nelson - Frank Sandler
- Sharon Farrell - Jesse Boone
- Sharon Farrell - Sandrelle
- Arthur O'Connell - Charlie Sherwin
- William Windom - D.W.
- William Windom - Charlie Ross
- Lorraine Gary - Carla Frazier
- Ed Asner - Cesare Marino
- Ed Asner - Vince Leonard
- Peter Mark Richman - Latimer
- Peter Mark Richman - Robert Coates
- David Opatoshu - Arthur Serokin
- David Opatoshu - Anartha
- Jack Kelly - Creighton Howell
- Jack Kelly - Frank Fowler
- Broderick Crawford - Wolf Lang
- Broderick Crawford - Harry Ricco
- Broderick Crawford - Bianchi
- Jack Hogan - Richter
- Honor Blackman - Bethany Cromwell
- Maurice Evans - Harold Wyler
- Brian Bedford - Anthony Malcolm
- Murray Matheson - Dave Rogers
- Anthony Caruso - Eddie Clark
- Eric Christmas - Alfred Crammidge
- Lester Matthews - Winston More
- Patrick O'Moore - Lord Lansdale
- Richard Peel - Martin Ross
- Steve Forrest - Walter Royce
- Steve Forrest - A.J. Ward
- Nigel Davenport - David Windom
- Anne Francis - Carol Sherman
- Anne Francis - Marsha Ryman
- Peter Davies - Stephen Grey
- Laurence Naismith - Reddington
- James Robertson Justice - Fitzwilliam
- Janice Rule - Madeline Grey
- Roddy McDowall - Philip Saxon
- Roddy McDowall - Early McCorley
- Michael Anderson Jr. - Bobby
- Norman Fell - Winston Polk
- Russ Tamblyn - John Earl
- Darren McGavin - Jesse Gil McCray
- Darren McGavin - Sam Hardy
- Darren McGavin - Eddie Gannon
- Sal Mineo - Sheldon
- Henry Jones - Mr. McKim
- Henry Jones - George
- George O'Hanlon - Manager
- Michele Carey - Evelyn Trager
- Denny Miller - Bill Beauregard
- Jessica Walter - Linda Ramsey
- Jessica Walter - Rita Mason / Allie Chambers
- John Kerr - Billy Keaton
- John Kerr - Stuart Clark
- Coleen Gray - Sylvia Trager
- Charles Boyer - Henri Jarnoux
- Vernon Dobtcheff - Dedushko
- Craig Stevens - Lang Roberts
- Shelly Novack - Mike Wojcik
- Shelly Novack - Russ Dickson
- Davey Davison - Julie Witten
- Dorothy Lamour - Stella Fisher
- Arch Johnson - Sergeant Cook
- Arch Johnson - Harry Murdock
- Rafael Campos - Quito Mendares
- Barry Sullivan - Creston Collins
- Barry Sullivan - Dane Bigelow
- James Whitmore - Harry Roarke
- Clu Gulager - Bill Danziger
- Clu Gulager - Steve Heywood
- Clu Gulager - Rex Dakota
- David Sheiner - Lieutenant Martinez
- David Sheiner - Colonel Bandar
- Strother Martin - Nanyface
- Keenan Wynn - Joe Williams
- Keenan Wynn - Ed Wallaby
- Keenan Wynn - Lester
- Marsha Hunt - Claudia Loring
- Michael Larrain - Greg Roarke
- Jan Sterling - Elsa Roarke
- Bernie Hamilton - Jason
- Bernie Hamilton - Doc Cullen
- Dennis Weaver - Walter Grayson
- Sándor Szabó - Professor Zorkin
- Diane Baker - Elaine Brennan
- Phyllis Kirk - Edith
- Karen Black - Monica Garrison
- Sue Ane Langdon - Harriet
- Sandra Gould - Bonnie
- Hal Holbrook - John Adrian
- Diana Hyland - Lisa Adrian
- Carla Borelli - Holly
- Carla Borelli - Priscilla
- Carla Borelli - Lisa Bertelli
- Joanna Barnes - Ardith Williams
- George Murdock - Dave
- George Murdock - George Bertrand
- George Murdock - Joe Ames
- Charles Drake - Tom Laraby
- Robert DoQui - Ollie O'Neill
- Ron Hayes - James Wynn
- Ida Lupino - Monique Madison
- Roy Jenson - Dillon's Interrogator
- Jill Townsend - Jackie Buchanan
- Jill St. John - Michelle Howell
- Kaz Garas - Sheriff Finnegan
- Rod Cameron - Esau Billings
- Cliff Potts - Andy Hill
- John Colicos - Rafael
- William Conrad - Arnold Wexler
- John Ireland - Mel Wexler
- Gene Raymond - Senator Reeland
- Barbara Werle - Roberta
- Antoinette Bower - Katherine Benning
- Barry Atwater - Sheriff Lucas
- Edward G. Robinson Jr. - Carl Rodenski
- Ina Balin - Thalia
- Nico Minardos - Nikos
- Percy Rodriguez - Reston
- Percy Rodriguez - Paul Reston
- Pernell Roberts - Ernie Subich
- Pernell Roberts - Hank
- Tim O'Connor - Callahan
- Celeste Holm - Irene Comdon
- Ben Murphy - Joe Sample
- Herbert Anderson - Roger Dall
- Anthony Franciosa - Jeff Dillon
- Lee Meriwether - Bridget
- Hazel Court - Miss Playfair
- Mark Miller - Ross Craig
- Mark Miller - Luther Storm
- Mark Miller - Nate Pearson
- Yvonne De Carlo - Mrs. Levene
- Rudy Vallee - Myron Lesser
- Edward Everett Horton - Philip Armistead
- Matt Clark - Frankie
- Matt Clark - Harris
- Susan Saint James - Peggy Maxwell
- Irene Tsu - Miss Takashima
- Anna Navarro - Madame Bandar
- Anna Navarro - Amelia
- Michael Ansara - Ben Kaliman
- Warren Stevens - Charles Lawrence
- H.M. Wynant - Colonel Mara
- Gloria Grahame - Madame Noh
- Robert Carricart - Colonel Kraton
- David Carradine - Jason Blake
- Tom Bosley - Charlie Reid
- Lee Grant - Edwina Booker
- Jacqueline deWit - Mattie
- Yaphet Kotto - Wyman Jackson
- Nehemiah Persoff - Ambassador
- Albert Paulsen - Benitez
- Hermione Gingold - Vivian Forsyte
- Arthur Hill - Gerald Brighton
- Michael Callan - Tommy Crail
- William Smithers - Dave Martin
- Charlie Picerni - Parker
- Len Wayland - Priest
- Len Wayland - Officer
- Gavin MacLeod - Lewie Franklin
- Ann Prentiss - Leona
- Pamela Franklin - Jenny Wilde
- Carolyn Jones - Lydia Mulholland
- Robert Lipton - Billy Wizard
- Charles Seel - Bellhop
- Peter Brocco - Man
- Don Keefer - Chaplain
- O.J. Simpson - Gas Chamber Prison Guard (uncredited)
- Norm Crosby - Norm Crosby
- Redd Foxx - Redd Foxx
- Brenda Scott - Suzie Murdock
- Brenda Scott - Angela Dean
- Diana Muldaur - Terry Lanson
- Ed Flanders - Lazlo Subich
- James B. Sikking - Police Lieutenant
- Robert Culp - Paul Tyler
- Robert Wagner - David Corey
- Richard Kiley - Dr. Judson Strode
- Richard Kiley - Arlen McKittrick
- Joan Blondell - Miss Wall
- Jan Murray - Doc Haller
- Bobby Troup - Slip Sherman
- Burt Brinckerhoff - Philip McKenna
- Madeleine Sherwood - Myra Louden
- Woodrow Parfrey - Dr. Felix Louden
- Ray Ballard - Photographer
- Ray Ballard - Shelly
- Warren Oates - Lew Weatherford / John Weatherford
- Albert Salmi - Luke Halloran / Warren (mayor)
- George Sawaya - Harv Miller
- David Wayne - Emory Ward
- Robert Emhardt - Creighton
- Tom Ewell - District Attorney Simpson
- William Lucking - Gruber
- Geraldine Page - Sister Lucia
- Shepperd Strudwick - Dr. Witherton
- Leslie Stevens
- Boris Sagal
- Dean Hargrove
- George Eckstein
- Norman Lloyd
- David Victor
Coleen Gray interpreta a Sylvia Trager en la serie.
Paul Winfield interpreta a Barada en la serie.
John Marley hace el papel de Frank Chaney.
Nehemiah Persoff interpreta a Ambassador en la serie.
Arthur O'Connell hace el papel de Charlie Sherwin.
Edward Everett Horton interpreta a Philip Armistead en la serie.
Vernon Dobtcheff interpreta a Dedushko en la serie.
David Carradine hace el papel de Jason Blake.
Stanley Adams interpreta a Mr. Stephens en la serie.
Julie Harris hace el papel de Verna Ward.
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