- Walter Brooke - Col. Arthur Merriam
- Neil Hamilton - Mr. Harkin
- Macdonald Carey - Elmer Pike
- Alejandro Rey - Juano Herrera
- Ida Lupino - Harriet Whitney
- Joseph Gallison - Page Boy
- John Ireland - William 'Scotty' Scott
- Adam Roarke - Paul Durbin
- Edd Byrnes - Bill Colbert
- Bruce Dern - Maynard
- Cornel Wilde - George Press
- Leif Erickson - General
- Nancy Kovack - Melinda Davis
- Aldo Ray - Sam Kimber
- Gloria Swanson - Mrs. Charlotte Heaton
- Arthur Kennedy - Dr. Walter Meade Taylor
- Philip Carey - Edward Martin
- Michael Burns - Frankie Kling
- Coleen Gray - Dorothy Nehf
- Linda Dangcil - Peggy Sue
- Chester Morris - Blaine Davis
- Clint Walker - David Wolfe
- Herschel Bernardi - Joe Monti
- Diana Hyland - Laura DeLinda Stevenson / Laura Murdoch
- Clancy Cooper - Sgt. Kelly
- Louis Jourdan - Colonel Bertine
- Sal Mineo - Ernie
- Claudine Longet - Marie Ange
- Tommy Sands - Eddie Riccio
- Larry Kert - Capt. Don Feruzzi
- James Gregory - Lieutenant Wade
- Perry Lopez - Candido Gomez
- Dina Merrill - Jo Andrews
- Roddy McDowall - Robert 'Professor' Benson
- Sue Randall - Anne Crane
- Barry Sullivan - Maj. Victor Hanley
- Carl Benton Reid - Judge
- Robert Quarry - Bob Detweiler
- Ben Gazzara - Paul Bryan
- Robert Fuller - Rory O'Rourke
- Jack Lord - Paul Campbell
- Martin Kosleck - Rudi
- Francis Lederer - Dr. Jeremias Lipp
- Joan Blackman - Lucille Burnside
- Tippi Hedren - Lee Anne Wickheimer
- Joan Staley - Marla
- Ian Wolfe - Ellis Stone
- Shelly Manne - Hermy
- Murray Hamilton - Capt. Appleton
- Barbara Rush - Karen Lownes
- Richard Conte - Jack Sallas
- Josephine Hutchinson - Mrs. Blanchard
- Gig Young - Hugo Myrich
- Lloyd Bridges - Mason Etheridge
- Sharon Farrell - Althea Winton
- Richard Crenna - Edward Smalley
- Mickey Rooney - Sheriff Williams
- Monica Lewis - Mrs. Caldwell
- Whit Bissell - Gus Hickman
- David Brian - Mark Nelson
- Frank Overton - Bruce Reynolds
- Adam Williams - Ben Jorgenson
- Edy Williams - Enes
- Ed Kemmer - Stewart
- Ed Gilbert - Inspector
- Eleanor Parker - Dorian Smith
- Jay C. Flippen - Hugh Ramsey
- Dean Stockwell - Martin Rosetti
- Beverly Garland - JoAnne Kling
- Don Diamond - Paco
- Jo Van Fleet - Hildy Hesse
- Charles Maxwell - German Colonel
- Mimsy Farmer - Joan
- Carol Lawrence - Marta Aviles
- Leslie Parrish - Susan King
- Larry Storch - Perry Shields
- John Marley - Luzet
- Ralph Meeker - Harly Clay
- Eddie Albert - Dr. Bert Andrews
- John Larkin - Foster Drake
- Richard Long - Maj. Ben Dawson
- Glenn Corbett - Lt. Christopher King
- Charla Doherty - Shirley Rankin
- Pippa Scott - Dr. Marianne Scott
- Antoinette Bower - Gillan
- Harold Sakata - Ching
- Lew Ayres - Dr. Thomas Clay
- Andrew Prine - Chris Sandee
- Kaaren Verne - Inge
- Dane Clark - Saul Baratseff
- Jean Hale - Lambie Lovelace
- Jerome Cowan - Sam Beeker
- Bradford Dillman - Capt. David Young
- Andrew Duggan - Dr. Adam Winters
- Byron Morrow - Leith Houser
- Nina Foch - Sarah Middleton
- Geraldine Brooks - Doris Etheridge
- Katharine Ross - Janet Bollington
- George Kirgo - Killer
- Mary Wickes - Mrs. Pike
- James Caan - Rick Peterson
- Robert Conrad - Gary Kemp
- Tina Louise - Angie Powell
- Lyle Bettger - Ted Johnson
- Dan Duryea - Lt. Boyd Manners
- Barbara Nichols - Ann Hilts
- Ulla Jacobsson - Ursula
- Barney Phillips - C.A. Thompson
- Roger Smith - Anthony Griswold Knight
- George Chandler - Doc Baines
- Malcolm Atterbury - Doctor Gregory
- Richard Kiley - Lou Franklin
- Lawrence Dobkin - Doctor (uncredited)
- Virginia Gregg - Kate Taylor
- Anne Helm - Avis Tyler
- Nicholas Colasanto - 1st Military Policeman
- Peter Duryea - Victor Palchek
- Milton Berle - Sam Morris
- Roger Perry - Capt. Gordon Robbins
- David Sheiner - Martin Clay
- Bruce Bennett - Gen. Adams
- Liam Sullivan - Alan Parsons
- Larry Pennell - Phil Scanlon
- Michael Rennie - Robert Thurston
- Richard Anderson - General John Doe
- Broderick Crawford - Walter 'Pop' Tullett
- Richard Beymer - Werner Schiff
- Eric Braeden - Gerd Hoffman
- Lee Patterson - Sgt. Joe Davidson
- Jeffrey Hunter - Fred Girard
- Dean Jones - Eddie Carew
- Gary Lockwood - Frank Connery
- Peter Graves - Maj. Frank Whitaker
- Frederick O'Neal - Jacques Serac
- Vincent Gardenia - Charlie Raines
- Robert Ryan - Thomas Bollington
- Telly Savalas - Ramon Castillo / Raymond Castle
- Telly Savalas - Beret
- Peter Lorre - Frederick Bergen
- Dabbs Greer - Newton Yort
- Ned Romero - Militiaman
- Pat Hingle - Ed Caldwell
- Clu Gulager - Dan Walsh
- Michael Ansara - Morgan
- Gene Roth - 1st Policeman
- John van Dreelen - Dr. Eduardo Lenzi
- Rod Lauren - Arturo Baroja
- Paul Newlan - Doc Pierson
- John Cassavetes - Peter Chandler
- Frank Silvera - Sgt. Terrell
- Frank Silvera - Captain Santos
- Harry Bellaver - Fred Brennan
- Martin Milner - Lieutenant John Corby
- Audrey Totter - Mrs. Myra Moran
- H.M. Wynant - Escobar
- Robert Duvall - Harvey Farnsworth
- Julie Harris - Lucy Bram
- Albert Dekker - Karl Hesse
- Don Dubbins - Corporal Shale
- Robert Pine - Denny Wentworth
- Julie Adams - Joanne Clay
- Julie Adams - Ellen Yarnell
- Alan Caillou - Group Capt. Windermere
- Tom Tryon - Tom Banning
- Michael Pate - Johnny Slato
- Louis Mercier - Stoss
- Robert Webber - Robert Burke
- Elsie Baker - Old Woman
- John Banner - Martin Rutke
- Lloyd Bochner - Wolfe Hastings
- William Fawcett - Mr. Robinson
- Stanley Adams - Pinky Ferguson
- Peter Breck - Wiley Bondesen
- Don Marshall - Cpl. Jenks
- Steve Forrest - Mike Taggart
- Steve Forrest - David Buchanan
- Martha Hyer - Helen Blaine
- Martha Hyer - Caroline Glenn
- Phillip Pine - Ellis
- Dana Wynter - Mrs. Anne Palmer
- Keenan Wynn - Charlie Kling
- Jack Klugman - Ozzie Keefer
- Jack Klugman - Steve Zaro
- Jack Warden - Jack Fleming
- Gary Merrill - Mark Jordan
- Steve Ihnat - Pit Boss
- Ellen Burstyn - Barbara Sherwood / Lucille Benton
- Jan Shepard - Policewoman
- Robert Loggia - Colonel Juano Chauvin
- Robert Loggia - Mario Robrioz
- William Smith - Deputy Raynor
- Ronald Reagan - Judge Howard R. Stimming
- Paul Comi - Donnelly
- Jesse White - Emil Glueck
- Lilia Skala - Lina Rosetti
- Don Collier - Detective Sgt. Newsome
- Don Collier - Luke Adams
- Robert Clarke - Adam Conway
- Dabney Coleman - William Gunther
- Dabney Coleman - Alvin Piper
- Brian Keith - Andy Bastian
- John Hoyt - Mr. Orbin
- Mala Powers - Ellen Ramsey
- Ron Hayes - Luther Hobbs
- Ron Hayes - Deputy Dave Willett
- Richard Venture - Second Detective
- Robert Goulet - Private LeRoy Brubaker / James O. Vitelli
- Henry Jones - Prof. Raymond Shipley
- Rafael Campos - Alonzo
- Robert Ellenstein - Dendier
- Robert Ellenstein - Raskob / Stevenson's attorney
- Webb Pierce - Prescott
- Jack Ging - Navigator Mike Andre
- S. John Launer - Dr. Manson
- Walter Woolf King - 1st VIP
- Patrick Whyte - Medwin
- Barry Kelley - Charlie Montague - Bank Guard
- Nancy Malone - Pat Corby
- Nancy Malone - Nurse Linda Beaumont
- Lloyd Nolan - Gen. Amos Bailey
- Gena Rowlands - Janet Cord
- Gena Rowlands - Lois Baxter
- John Anderson - Rankin
- Anne Francis - Peggy Merritt
- Paul Langton - Sheriff Johnny Kyle
- Anna Navarro - Maria
- Leonard Nimoy - Lawrence Brody
- Leonard Nimoy - Cowell
- Jack Weston - Joao Esposa
- Jack Weston - Homer Fargis
- Stephen McNally - Major Sanford
- Phyllis Thaxter - Mildred Zaro
- Tol Avery - 3rd Judge
- Tol Avery - Publisher
- Anthony Caruso - Cuero
- Norbert Meisel - 1st Man
- Bill Erwin - Father Daley
- Al Hirt - Self - Musician
- James Whitmore - J. Marvin Bean
- James Whitmore - Major Will Stanton
- Ann Blyth - Lady Mei
- John Forsythe - Maj. William 'Bill' Livingston
- John Forsythe - Jerry Wilson / John Williams
- Wright King - Chaplain
- Pat O’Brien - Lt. John Curwood
- Pat O’Brien - Inspector Dan Zarilla
- Pat Renella - First Detective
- Claude Akins - Sergeant Phil Henning
- Peter Brown - Chris Forrester
- Peter Brown - Lieutenant Ben Hollister
- Don Gordon - Millard Severin
- William Keene - Captain
- Joe Mantell - Frankie Shields
- Julian Rivero - Old Man
- Harlan Warde - Colonel
- Roland La Starza - Bugs
- Michael Fox - Howard Link
- Myrna Fahey - Honora Malone
- Myrna Fahey - Mrs. Janet 'Jan' Banning
- Larry Blyden - Lester Pennell
- Stefan Arngrim - Nick Camion
- Norman Fell - Sgt. Max Winkler
- Harry Townes - Richard
- Harry Townes - Felix Potter
- Thalmus Rasulala - Police Sergeant
- Thalmus Rasulala - Technician
- Mort Mills - Victor Prelling
- Peter Helm - Private Cutler
- Peter Helm - Willis Maudry
- Kevin Hagen - Nilsen
- Danny Bravo - Juan
- Gregory Gaye - Russian Minister
- Oscar Beregi Jr. - Schneider
- Frank De Kova - Edward
- Sigrid Valdis - Ruby
- John Gavin - Tom Threepersons
- John Gavin - Carlos
- Victor Jory - Conrad Easter
- Fred Holliday - Duty Officer
- Jason Wingreen - Savadow
- Ethel Merman - Clara Lovelace
- Ben Wright - German Commandant
- Ben Wright - Casino Manager
- Sheldon Allman - Buddy Stipp
- Ric Marlow - George
- Vera Miles - Ann Ryker
- Michael Masters - German Sergeant
- Naomi Stevens - Norma
- Edmon Ryan - Dr. Davis
- Bill Walker - Trustee
- Albert Carrier - Frenchy
- Bob Johnson - Porter
- Jack Kelly - Pete Braven
- Jack Kelly - Charles Glenn
- Jack Kelly - Tony Camion
- Ben Cooper - Sam Grayson
- Richard X. Slattery - Sgt. Wade Muller
- Richard X. Slattery - Lester
- Diane McBain - Mary Jorgenson
- Diane McBain - Diana Weston
- John Harmon - Pogo
- Kathryn Hays - Terry Camion
- Lee Marvin - Sgt. Paul Ryker
- David Lewis - Alan Brossanquet
- David Lewis - R. Randolph Wetherill
- Albert Paulsen - Sif Barani
- Warren Stevens - Detective Sgt. Phil Hadley
- Warren Stevens - Alden Ritter
- Warren Stevens - Mark Wilton
- Owen Bush - Driver
- Myron Healey - Lt. Bill Thaler
- Myron Healey - George Whitney
- Reggie Nalder - 1st SS Agent
- William Phipps - Frank
- Scott Marlowe - Sherman 'Sherm' Tyler
- Scott Marlowe - Johnny Baroja
- Monroe Arnold - Dr. Duveen
- Leslie Nielsen - Paul Maytric
- Leslie Nielsen - Dr. David Cord
- Lane Bradford - Sgt. Kubek
- Rusty Lane - Warden
- Rusty Lane - Doc Stacey
- Craig Huxley - Mark
- Susanne Cramer - Anna
- Susanne Cramer - Elena
- Charles Aidman - Maj. Kitchener
- Malachi Throne - Nickolai Brovko
- Malachi Throne - L. J. West
- Dan Frazer - Mr. Chilton
- Val Avery - Sergeant
- Val Avery - Colonel Velasquez
- Pauline Drake - Police Woman
- Ken Mayer - Sheriff
- Garry Walberg - Dr. Martin Sorbin
- Frank Maxwell - Arthur Jensen
- Frank Maxwell - Albert Perkins
- Frank Maxwell - Dr. Jackson 'Jack' Burnham
- Herb Armstrong - Doctor
- Robert Ridgely - Dan McVeay
- Ted Knight - Carl Lombardo
- Barbara Turner - Bernadette
- Charlene Lee - Wynnette
- Don Dillaway - 2nd VIP
- Sally Kellerman - Jean Severin
- William Boyett - Highway Patrolman Caulfield
- William Boyett - 1st Detective
- Douglas A. Alleman - Ralph
- Gila Golan - Constanze 'Tantsy' Lipp
- Arlene Kieta - The Blond
- Philip Abbott - Myron Ellis
- Philip Abbott - Major Charles Wheeler
- Douglas Henderson - Skippy
- Douglas Henderson - Harry Grayson
- John A. Alonzo - Officer Miller
- Tom Allen - Assistant District Attorney
- Robert H. Harris - Officer Newman
- Mary Frann - Annette
- Don Kennedy - Highway Patrolman
- Don Kennedy - Police Officer
- Indus Arthur - Elizabeth Pike
- Indus Arthur - Lois Brennan
- Charles McGraw - Harry Brockman
- Charles McGraw - Nick Stacy
- Berkeley Harris - Public Defender
- Berkeley Harris - Pike
- Berkeley Harris - Pete Francis
- Hugh O'Brian - Detective Matt Lacey
- Katherine Crawford - Daphne Middleton
Naomi Stevens interpreta a Norma en la serie.
Coleen Gray interpreta a Dorothy Nehf en la serie.
Jay C. Flippen interpreta a Hugh Ramsey en la serie.
James Caan hace el papel de Rick Peterson.
Robert Duvall interpreta a Harvey Farnsworth en la serie.
Richard Conte hace el papel de Jack Sallas.
Peter Lorre hace el papel de Frederick Bergen.
John Marley hace el papel de Luzet.
Josephine Hutchinson hace el papel de Mrs. Blanchard.
Pat O’Brien interpreta a Inspector Dan Zarilla en la serie.
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