- Lynda Day George - Dana Lambert
- Martin Landau - Rollin Hand
- Martin Landau - Rollin Hand / General Rio Dominguez
- Gerald S. O'Loughlin - Bert Gordon
- Anne Francine - Maude Brophy
- King Moody - Det. Lt. Bruce Leonard
- Herbert Jefferson Jr. - Luddy
- John Ireland - Andrew Metzger
- Lou Antonio - Robert Siomney
- Luke Askew - Victor Pietro Duchell
- Ron Randell - Charles Buckman
- Carl Betz - General Yuri Kozani
- Joseph Bernard - Comandante
- Angela Clarke - Emily Cardel
- Sal Mineo - Mel Bracken
- Abraham Sofaer - Tomas de Cuarto
- Bo Svenson - Karl
- Michael Ansara - Ed Stoner
- Morgan Farley - Dr. Milton Wyatt
- Arlene Martel - Atheda
- J.D. Cannon - Miklos Klaar
- Paul Stewart - Jonas Stone
- Darren McGavin - J. Richard Taggart
- Benson Fong - Inspector Akita
- Denny Miller - Arthur Norris
- Nicholas Colasanto - Jimmy Bibo
- Victoria Vetri - Eve Zembra
- Brock Peters - Walter DuBruis
- John Randolph - Alex Morley
- John Beck - John Hecker
- Marianna Hill - Louisa Rojas
- Loretta Swit - Midge Larson
- Greg Mullavey - Heinz
- Donald Randolph - Everett Buchanan
- Jerry Jones - Cabbie
- Dina Merrill - Meredyth
- Edmond O'Brien - Raymond Halder
- Simon Oakland - Jack Wellman
- Lilyan Chauvin - Mrs. Beruch
- Luther Adler - Leo Vorka
- May Britt - Eva Gollan
- Robert DoQui - John Darcy
- George Sanders - Armand Anderssarian
- John van Dreelen - Prime Minister Henrik Durvard
- Philip Ahn - Dr. Liu
- Martin Kosleck - General
- Margarita Cordova - Zorka
- Perry Lopez - Priest
- Anna Lee - Maria Malik
- Will Geer - Doc
- Clete Roberts - Announcer
- Don Marshall - The Police Officer
- Henry Silva - Norvan Kruger
- Albert Dekker - Colonel Shtemenko
- Kent Smith - Senator William Townsend
- Martin Sheen - Lieutenant Albert Brocke
- Barry Sullivan - Alex Lowell
- Jack Cassidy - Orin Kerr
- Theodore Bikel - General Casimir Zepke
- Rodolfo Acosta - Presidente Miguel De Varo
- Noel Harrison - Nicolai
- Francis Lederer - Senko Brobin
- Martine Bartlett - Ariana Domi
- George Takei - Roger Lee
- Wally Cox - Terry Targo
- Donald Harron - Ernst Graff
- Jane Merrow - Lady Cora Weston
- Sally Ann Howes - Beth
- Gene Dynarski - Sgt. of Guard
- Jill Haworth - Enid Brugge / Marla Kassel
- Nico Minardos - Carlos Empori
- Robert Middleton - Clavering
- Stephen McNally - Kruger Schtelman
- Bradford Dillman - Paul Shipherd
- Brooke Bundy - Katherine
- Mary Ann Mobley - Crystal Walker
- Cicely Tyson - Alma Ross
- Andrew Duggan - Justin Bainbridge
- James Shigeta - Shiki
- Pat Priest - Kathrine Berat
- Abbey Lincoln - Millie Webster
- Barry Coe - Willard
- Christopher Connelly - Dr. Jerome Carlin
- Lloyd Bridges - Anastas Poltroni aka Ted Carson
- Carroll O'Connor - Josef Varsh
- Peter Donat - Arthur Warner
- Robert Alda - Diego Maximillian
- Wilfrid Hyde-White - Otto Kelmann
- George Maharis - Thomas Bachman
- Kathleen Hughes - Fran Williams
- Jean Del Val - Mr. Wolf
- Lawrence Dobkin - Colonel Alex Kohler
- Katherine Woodville - Felicia Vabar
- Richard Romanus - Guard
- Warren Stevens - Frank Layton
- Warren Stevens - Karl de Groot
- Ricardo Montalban - Gerard Sefra
- Renzo Cesana - Gustavo Fortuna
- Nan Martin - Grand Duchess Teresa
- Rhys Williams - Prime Minister Ferenc Larya
- Lee Grant - Susan Buchanan
- Charles Aidman - General Envir Qaisette
- Harold Gould - Vincente Bravo
- John Williams - Lord Richard Weston
- Beatrice Straight - Dr. Martha Richards Zubrovnik
- John Larch - Premier Anton Rojek
- Oscar Beregi Jr. - The Commandant
- James Daly - Carl Wilson / Josef Gort
- Pat Hingle - R.J. McMillan
- Marion Ross - Mrs. Foster
- Hari Rhodes - George Corley
- Jacqueline Scott - Cynthia Owens
- Dana Elcar - C.W. Cameron
- Dale Ishimoto - Saburi
- Scott Marlowe - Josef Czerny
- Dean Stockwell - Gunnar Malstrom
- Joan Collins - Nicole Vedette
- Lin McCarthy - George Forrester
- Val Avery - Al Ross
- Val Avery - Constantine Victor
- Barry Williams - King Victor
- Robert Conrad - Eddie Lorca
- Robert Conrad - Bobby
- Victor French - Leduc
- Sharon Acker - Connie Hastings
- Sharon Acker - Annette
- Larry Pennell - Karl Burroughs
- Hazel Court - Catherine Hagar
- Jessica Walter - Valerie
- Peter Mark Richman - Gen. Stefano Aragas
- Peter Mark Richman - Dr. Hargreaves
- Leon Askin - Riva
- William Shatner - Joseph Conrad
- William Windom - Deputy Premier Milos Pavel
- William Windom - Alex Cresnic
- Patricia Smith - Julia Keith
- Judith Brown - Lisa
- Diana Ewing - Stephanie
- Helen Funai - Nobu Kellem
- Jennifer Bishop - Hostess
- Tol Avery - Samuels
- Tol Avery - Stone
- Joe Maross - Sheriff Brad Owens
- Joe Maross - Frank Bates
- Joe Maross - Mark Walters
- Richard Peel - Guide
- Donald Davis - Sigismund Poljac
- Sid Haig - Musha
- Sid Haig - Sperizzi
- Sid Haig - Major Carlos Martillo
- Sid Haig - Agent
- Sid Haig - Hidalgo
- Sid Haig - Goujon
- Sid Haig - Grigor
- Sid Haig - Marko
- Arthur Franz - First Minister Andre Picard
- Arthur Franz - Dr. Adler
- Anita Mann - Ilsa
- William Smithers - Victor Tomar
- William Smithers - Frank Egan
- Al Bain - Citizen (uncredited)
- William Benedict - Denver
- Jon Shank - Frank Colby (uncredited)
- Anthony Larry Paul - Gate Guard (uncredited)
- James Almanzar - Lieutenant Barata
- James Hong - Yin
- Jenifer Shaw - Susan Mitchell
- Susan Howard - Nora Dawson
- Sam Elliott - Doug Robert
- Jason Evers - Walter Townsend
- Jason Evers - Ray Dunson
- Fred Beir - Joe Keith
- Frank Webb - Seth Morley
- Owen Bush - Reynolds
- Michael Forest - Lupesh
- Norbert Schiller - Lauchek
- Nehemiah Persoff - Igor Stravos
- Nehemiah Persoff - Phillipe Pereda
- Nehemiah Persoff - Prince Iben Kostas
- Richard Reed - Dorlan
- John Dehner - Dan Whelan
- Jack Gordon - Bookie (uncredited)
- Jack Gordon - Policeman (uncredited)
- Richard Kelton - Billy Walsh
- Russell Thorson - Chief Danby
- Cyril Delevanti - Cardinal Vossek
- Monte Markham - Tosk
- Dehl Berti - Makar
- Dehl Berti - Young Zookeeper
- John Stephenson - Director
- Kevin Hagen - David Webster
- Kevin Hagen - Dave Klinger
- Kevin Hagen - Kurt Lom
- Buddy Joe Hooker - Driver (uncredited)
- Phillip Pine - Arnold Grasnik
- Joe De Santis - Maj. Marak
- Joe De Santis - Vito Scalisi
- Joe De Santis - Jorge Cabal
- Nick Benedict - Corporal
- Nick Benedict - Guard in Kitchen
- Eric Feldary - Assistant Director
- Vince Deadrick Sr. - Private
- Lew Palter - Lawyer
- Alfred Shelly - Guard #1 (uncredited)
- Alfred Shelly - Gate Guard
- Alfred Shelly - Guard
- Dan O'Herlihy - Jack Cole
- Robert Yuro - Arnie
- Robert Yuro - Hawks
- Ruth Roman - Riva Santel
- George Gaynes - Dr. Paul van Bergner
- Joseph Ruskin - King Ibn Borca
- Joseph Ruskin - Colonel Scutari
- Joseph Ruskin - Colonel Hatafis
- Joe Lo Presti - Mechanic (uncredited)
- George Tyne - Dr. Premel
- John Orchard - Maharis
- Leonard Stone - Major Alud
- Leonard Stone - Dimitri Soska
- Britt Lomond - Thornton
- Émile Genest - Dr. Kronen
- Émile Genest - Technician
- Lawrence Montaigne - Kostas's Aide
- Ta-Tanisha - Maryana 'Gabby' Renfrow
- John Alderson - Follet
- Pernell Roberts - President Beyron Rurich
- Pernell Roberts - Chief Manuel Corba
- Pernell Roberts - Col. Hans Krim
- Elaine Church - Pharmacist's Wife
- Frank Marth - Alexander Vanin
- Frank Marth - Koler
- Joe Morton - Clerk
- Kirk Scott - Guard
- Jon Cypher - Art Stafford
- Nancy Jeris - Nancy Stoner
- Eric Braeden - Col. Markus von Frank
- Eric Braeden - Andrei Fetyakov
- William Sargent - Dr. Edward Stoner
- Bob Purvey - Alex Khora
- Jonathan Goldsmith - Father Sebastian
- Michael St. Clair - Shah
- Michael St. Clair - Blacksmith
- David Roya - Klos
- Donnelly Rhodes - Joel Morgan
- Donnelly Rhodes - Raymond Barret
- Donnelly Rhodes - Lou Merrick
- Barbara Anderson - Mimi Davis
- Vince Howard - Patrolman Frank Dagget
- Vince Howard - Max Davis
- Madlyn Rhue - Adele Cooper
- Booth Colman - Stravos
- Booth Colman - Dr. Huss
- David Hurst - Victor Grigov
- David Hurst - Dr. Oswald Beck
- Steve Franken - Akim Hadramut
- David Mauro - Prince Fasar
- Peter Lorre Jr. - Kadi
- Donald Moffat - Alex Pierson
- Bill Fletcher - Brucker
- Bill Fletcher - Stan
- John Schuck - Lieutenant Jocaro
- Alf Kjellin - Stefan Prohosh
- Alf Kjellin - Carl Vandaam
- Michael Constantine - Janos
- Joaquín Martínez - Desk Guard
- Joe Mantell - Augie Gorman
- Ted Jordan - Gunman
- John Colicos - Milos Kuro
- John Colicos - Chief of Internal Security Manuel Ferrar
- John Colicos - Commissioner Taal Jankowski
- Henry Darrow - Gregory Tolan
- Charles Dierkop - Richie
- Douglas Henderson - George Miller
- Douglas Henderson - Henry Packard
- Douglas Henderson - Anders
- Joseph Campanella - Dr. Helmut Cherlotov
- Joseph Campanella - Captain Miklos Cherno
- Lee Farr - Jack Welton
- Paul Micale - Desk Clerk
- Patrick Campbell - Day Vault Clerk
- Joe Breen - Loft Manager
- Don Francks - Major Alex Denesch
- Don Francks - Nicholas Groat
- Vic Tayback - Sgt. Gorte
- Vic Tayback - Egan's Goon
- Lloyd Bochner - Mayor Steve Tallman
- Lloyd Bochner - Gen. Oliver Hammond
- Lloyd Bochner - Maj. Nicholas Zelinko
- Fritz Weaver - Erik Hagar
- Fritz Weaver - Imre Rogosh
- Fritz Weaver - George Berlinger
- Fritz Weaver - Emil Skarbeck
- Martin E. Brooks - Paul Trock
- Jerry Douglas - Danny Moore
- Jerry Douglas - Marvin Rogers
- Horst Ebersberg - Otto
- Torin Thatcher - Archbishop Djelvas
- Torin Thatcher - General Rados Adolph Gollan
- Jeremy Slate - Frederick Hoffman
- Vincent Gardenia - Vito Lugana
- Vincent Gardenia - Lewis George Parma
- Mark Tapscott - Captain
- Mark Russell - Plainclothesman (uncredited)
- Mark Russell - Benjamin Dane's Henchman (uncredited)
- Mark Russell - Ceremony Guest
- Charles Drake - Mitchell Connally
- Jack Ging - Hawks
- Chuck Hicks - Security Guard
- Percy Rodriguez - Jara
- Percy Rodriguez - Arturo Sandoval
- Percy Rodriguez - Captain Trez
- Bert Freed - Leon Chandler
- Bert Freed - Gen. Brenner
- Don Knight - Tim Rorke
- Helen Boll - Nurse / First Floor Guard
- Helen Boll - Nurse
- James Patterson - Johnny Costa
- James Patterson - Victor Laszlo
- William Keene - Janos Karq
- John McLiam - Anton Usakos
- John McLiam - Dr. Wilson Cardel
- Eddie Carroll - Street Photographer
- James Lanphier - Klimi
- Noah Keen - Captain Rudolf Olni
- Noah Keen - Gen. Androv
- Noah Keen - Dr. McConnell
- Rudy Doucette - Guard
- Alex Cord - Peter Cordel
- Malachi Throne - Ambassador Brazneck
- Malachi Throne - Deputy Premier Gregor Kamirov
- Marlyn Mason - Sandy
- Peter Breck - Harry Cordel
- Ramon Bieri - Colonel Jaroslav Sardner
- Ramon Bieri - Colonel Rodriguez
- Roberto Contreras - Captain Avila
- Roberto Contreras - Capt. Mestovo
- Owen Orr - Karl
- Dick Cherney - Worker (uncredited)
- Dick Cherney - Guard (uncredited)
- Mark Lenard - Colonel Bakram
- Mark Lenard - Felipe Mora
- Mark Lenard - Col. Luis Cardoza
- Mark Lenard - Aristo Skora
- Alex Bookston - Man in Arcade
- Lawrence Dane - Dr. Anton Yubov
- Lawrence Dane - Martin Stoner
- Lawrence Dane - Commandante Juan Acero
- Mort Mills - William Conway
- Mort Mills - Al Souchek
- Roger Til - Baccarat Croupier
- David Renard - Carlos
- Woodrow Parfrey - Collins
- Woodrow Parfrey - Henks
- Nicholas Georgiade - Vito Nicola
- Jonathan Kidd - The Registrar
- Edmund Tontini - The Nationalist
- Tom Hernández - The Desk Sergeant
- Cheryl Callaway - Sandy
- Richard Devon - Inspector Gulik
- Warren Vanders - Holbeck
- Michael Shea - Pieter Stakovar
- Lynn Wood - The Mother
- Arthur Hill - Janos Passik
- Phil Posner - Portisch
- Barry Russo - Tiso Kastner
- Barry Cahill - Guard
- Rick Traeger - Instructor
- Alberto Monte - The Attendant
- William Smith - John Brent
- William Smith - Vincent Sandler
- William Smith - Dekker
- Ben Hammer - Callao
- Ann Ayars - Señora Del Barra
- David Sheiner - James Reed
- David Sheiner - Colonel Ziegler
- David Sheiner - Dr. Karl Turek
- Marco López - Police Officer (uncredited)
- Marco López - Cameraman
- Joseph Sirola - Suverin
- Edward Colmans - Professor Napolsky
- Albert Paulsen - Albert Zembra
- Albert Paulsen - General Ernesto Neyron
- Albert Paulsen - Joseph Baresh
- Albert Paulsen - Eric Bergman
- Robert Ellenstein - Dr. M. Vazan
- Robert Ellenstein - Deputy Premier Voss
- Robert Ellenstein - Dr. Emil Gorin
- Patrick Horgan - Wolfe
- Walter Friedel - Lt. Euler
- Mala Powers - Dr. Karen Cherlotov
- Elisa Ingram - Sophia
- Alex Rodine - Duchinoff
- Norbert Meisel - Berkov
- Robert Boon - Kravetsky
- Felix Locher - Yablonski
- Gail Kobe - Lisa Goren
- John Crawford - Orin Selby
- John Crawford - Dr. Lubell
- Don Keefer - Zubin
- Ivan Triesault - Plantinov
- Harry Davis - Hans Van Meer
- Lee Meriwether - Tracey
- Lee Meriwether - Anna Rojak
- Peter Bourne - Peters
- Gene Roth - General von Cramm
- Bruce Glover - Major Deiter
- Bruce Glover - Ernst Bandar
- Paul Genge - Frick
- Julie Gregg - Anna Kerkoska
- Julie Gregg - Monique
- Larry J. Blake - Eckhart
- Warren J. Kemmerling - Raff
- James Gavin - Deputy
- Ivor Barry - Chief Inspector Banco
- Ivor Barry - Edmund Moore
- Ivor Barry - Ian McCloud
- Ivor Barry - Deputy Premier Tomas Avilla
- Robert B. Williams - Proprietor
- Tom Troupe - David Day
- Logan Ramsey - Colonel Vargas
- Logan Ramsey - Anton Valdas
- Julian Burton - Petyov
- William Schallert - Dr. Harrison Selby
- Peter Brocco - Dr. Valari
- Peter Brocco - Father Bernard
- Sorrell Booke - Peter Kiri
- Stanley Waxman - Jonathan Davis
- Pat Michenaud - Duv
- Jean-Michel Michenaud - Fydor
- Kurt Kreuger - Polya
- Charlie Picerni - Keller
- Charlie Picerni - Juan Delgado
- Charlie Picerni - Danny Ryan (uncredited)
- Charlie Picerni - Border Guard
- Albert Carrier - Morat
- Albert Carrier - Captain
- Joyce Easton - The Clerk
- Eartha Kitt - Tina Mara
- Lonny Chapman - Edward Hughes
- Antoinette Bower - Amara
- Antoinette Bower - Olga Vanin
- Antoinette Bower - Nora Bennett
- Michael Rye - The Real Belson
- BarBara Luna - Wai Lee
- BarBara Luna - Elena Maria Del Barra
- Richard Anderson - Judge Wilson Chase
- Larry Linville - Capt. Gulka
- Larry Linville - Colonel Leo Orlov
- Larry Linville - Alexi Silensky
- Michael Pataki - Ed
- Robert Padilla - Guard
- Robert Padilla - First Guard
- Michael Tolan - Vitol Enzor
- Michael Tolan - Ismet El Kebir
- Michael Tolan - Santos Cardoza
- Barbara Darrow - Proprietress
- Claude Woolman - Williams
- Claude Woolman - Paul von Schneer
- Michael Pate - Gen. Diaz
- Lee Bergere - Alfred Kuderlee
- Lee Bergere - Dr. Labashi
- Lev Mailer - Sergeant
- Fernando Lamas - Roger Toland
- Fernando Lamas - Ramon Prado
- Richard Jaeckel - Edward Trask
- Charles Napier - First Guard (uncredited)
- Charles Napier - Thug
- Charles Napier - Roland (uncredited)
- Charles Maxwell - Bok
- Charles Maxwell - Lazloff
- Timothy Brown - Barret (uncredited)
- Lloyd Battista - Chief of Police Francisco Diaz
- Lloyd Battista - King Selim / Prince Samandal
- Michael Fox - Dr. Levya
- Milton Selzer - Dr. Erich Rojak
- Milton Selzer - January Vornitz
- Milton Selzer - Inspector Koder
- Steven Marlo - Diego
- Steven Marlo - Faud
- Robert Karnes - Dr. Owen Siebert
- Michael Shillo - Raf Tagoor
- Rockne Tarkington - Paul Giroux
- Joan Tompkins - Miss Putnam
- Russ Bender - Duty Guard
- Pete Kellett - Guard
- Steve Ihnat - Stefan Miklos
- Steve Ihnat - Maj. Paul Johan
- Steve Ihnat - Col. Alex Stahl
- Troy Melton - Driver
- Linda Sue Risk - Rene
- Paul Lambert - Al Morgan
- Joan Staley - Ginny
- Stuart Nisbet - Dr. Emerson Reese
- Eduardo Ciannelli - Jack Rycher
- Michael Strong - Yorgi Petrosian
- Michael Strong - Stephan Gomalk
- Michael Strong - Barsky
- Michael Strong - Police Chief Petrovitch
- Walter Mathews - The Detective
- Walter Mathews - Sammy Gilbert
- Don Hanmer - Trubner
- Robert Webber - Charles Rogan
- Van Williams - Arnold Sanders
- Lana Wood - Marcy Carpenter
- Biff Elliot - Kid Wilson
- Biff Elliot - Guard
- Paul Gleason - Lieutenant Blair
- Nick Dimitri - Guard (uncredited)
- Arthur Batanides - Tino
- Arthur Batanides - Kura
- Arthur Batanides - Father Paolo Dominguin
- Arthur Batanides - Valenkoff
- Curt Lowens - Captain Stevya
- Curt Lowens - Major Mecklin
- Curt Lowens - Daglieri
- George Sawaya - Guard (uncredited)
- Richard Morrison - Karl
- Edward Knight - Nikos
- John Vernon - General Ramon Sabattini
- John Vernon - Colonel Josef Strom
- John Vernon - Ramone Fuego
- Anthony Zerbe - David Redding
- Anthony Zerbe - Col. Alex Vorda
- Anthony Zerbe - Eric Schilling
- Anthony Zerbe - Colonel Helmut Kellerman
- Joe E. Tata - Roulette Croupier
- Joe E. Tata - King Said
- Nikita Knatz - Sergeant
- Will J. White - Sergeant
- Ed McCready - Steward
- Ed McCready - Inspector
- Ed McCready - Teletype Clerk
- Vincent Van Lynn - Oliver Borgman
- Vincent Van Lynn - Kutzof
- Michele Guarini - Opponent
- Todd Martin - Lieutenant Ross
- Todd Martin - Captain Ionescu
- Todd Martin - The Father
- Francisco Ortega - Joshu
- James B. Sikking - Corrigan
- James B. Sikking - Wilson
- A.G. Vitanza - Purser
- Jack Donner - Buccaro
- Jack Donner - Captain Praedo
- Jack Donner - Bob Field
- Jack Donner - John Dawson
- Jack Donner - Driver
- Jack Donner - Stan Sherman
- Jack Donner - Buccaro (uncredited)
- Martin Ashe - Steve Lawson
- Martin Ashe - Clerk
- Jon Cedar - George Corley
- Lou Robb - Clerk
- Lou Robb - The Doctor
- Lou Robb - Lt. Vasney
- Keith McConnell - Tom
- Frank Campanella - Eddie Burke
- Robert Phillips - Johnny
- Robert Phillips - Ernie Staczek
- Richard Bull - Lorkner
- Richard Bull - Oliver Donovan
- Max Kleven - The Attendant
- Max Kleven - Guard
- David Armstrong - Patrolman
- Paul Lukather - Lieutenant
- Paul Lukather - Moisev
- Eddie Ryder - Williams
- Brioni Farrell - January
- Robert Pickering - Marty
- Robyn Millan - Gina
- Dee Carroll - Liz
- William O'Connell - Instructor
- Pepe Callahan - Ortega
- Pepe Callahan - Colonel Ortiz
- Gregg Palmer - Deputy
- Glen Gordon - Desk Clerk
- Roy Jenson - Connie
- Scott Hale - Janos
- Fred Villani - Reporter
- Fred Villani - Tour Guide
- Fred Villani - Night Vault Clerk
- Charles H. Radilak - Chairman
- Gunnar Hellström - Frederick Rudd
- Gunnar Hellström - Friedrich Spindler
- Peggy Rea - Cleaning Woman
- Mills Watson - Guard
- Alfred Ryder - Colonel Borodin
- Alfred Ryder - Colonel Valentin Yetkoff
- Alfred Ryder - Gregor Mishenko
- Paul Winfield - Klaus
- Edmund Hashim - Valesquez
- Ernest Sarracino - Manuel Delgado
- David Opatoshu - Premier Roshkoff
- David Opatoshu - Ahmed Vassier
- David Opatoshu - Deputy Premiere Anton Kudnov
- Jay Della - Convict
- Lee Duncan - Frederico
- Lee Duncan - Reporter
- Gregory Gaye - Minister
- Judy Levitt - Nurse
- Art Stewart - Attendant
- Peter Hellman - Guard
- Paul Stevens - Frank Wayne
- Paul Stevens - Stanislaus Cardinal Souchek / Anton Nagorsk
- Paul Stevens - Alexi Kerkoska
- David Fresco - Ahmed
- David Fresco - The Libertadist
- Pitt Herbert - Hendricks
- Pitt Herbert - Desk Clerk
- John S. Ragin - Pharmacist
- John S. Ragin - Butler
- Leonidas Ossetynski - Grand Duke
- Peter Coe - Kramer
- Peter Coe - Laso
- Peter Coe - Maj. Abdul-al-Tarek
- Alphonse Martell - Dr. Vachtel
- Sugar Ray Robinson - Wesley
- Ron Rich - Richy Lemoine
- Wayne McLaren - Artie Calvitos
- Angus Duncan - Stan
- Peter Kilman - Stephan's Guard
- Peter Kilman - Corrigan
- Jimmy Lennon Sr. - Announcer
- Jimmy Gambina - Trainer
- Skip Homeier - Maj. January Gruner
- John Pickard - Doctor
- John Pickard - Commander Wardman
- Byron Keith - Dr. Henry Loomis
- George Sperdakos - Dr. Dromm
- George Sperdakos - Lieutenant Dreis
- Barbara Babcock - Major Maria Felder
- Geoffrey Lewis - Proctor
- Geoffrey Lewis - Lusk
- Gregory Sierra - Fernando Laroca
- Gregory Sierra - Gomal
- Gregory Sierra - Prado's butler
- Cosmo Sardo - Official
- Irene Kelly - Young Riva
- Harry Basch - Nicolai
- Diane Baker - Francesca
- Jack Denbo - Reporter
- Jack Denbo - IMF Captain
- Jack Denbo - Steward
- Jack Denbo - Deane
- Marjorie Bennett - Woman
- Socrates Ballis - Maintenance Man
- Socrates Ballis - Driver
- Socrates Ballis - Customs Man
- Arthur Tovey - Society Member (uncredited)
- Karl Swenson - Colonel Dubov
- Karl Swenson - Dr. Ziegler
- Jon Lormer - Minister
- Jon Lormer - Charles Gant
- Nate Esformes - Colonel Santagura
- Nate Esformes - Captain Vicente Barrera
- Nate Esformes - Lacerda
- Gregg Martell - Eddie
- Richard Angarola - Colonel Diaz
- Richard Angarola - The Policeman
- Richard Angarola - Tolima
- Jay Jostyn - Dr. Brandt
- James Wellman - Hotel Manager
- Allen Joseph - Dr. Tratzmer
- Allen Joseph - Dr. Green
- Allen Joseph - Doctor
- Allen Joseph - Max Wittstock
- John Zaremba - Dr. Jacob Bowman
- Milt Kogan - David Singleton
- H.M. Wynant - Lorkner
- H.M. Wynant - Gunther Schell
- H.M. Wynant - Capt. Strom
- Bob Harks - Mechanic (uncredited)
- Bob Harks - Bank Customer (uncredited)
- Bob Harks - Policeman (uncredited)
- Carol Andreson - Phonovision Girl
- Michael Bell - Captain Anders
- Conrad Parham - Airline Clerk
- Conrad Parham - Roerca
- Valentin de Vargas - Luis Corba
- Valentin de Vargas - Miguel de Ramos
- Richard Garland - Anton Reisner
- William Wintersole - The Captain
- William Wintersole - Raskov
- William Wintersole - Mueller
- William Wintersole - William Goslin
- Shepherd Sanders - Convict
- Shepherd Sanders - Plato
- Shepherd Sanders - Politician
- Michael Baseleon - Lt. Rab
- Michael Baseleon - Georgi Kull
- Michael Baseleon - Frank Stevens
- Aaron Fletcher - Professor William Bennett
- Aaron Fletcher - Desk Clerk
- Aaron Fletcher - Doctor
- Paul Carr - Dr. Zeped
- Larry Vincent - Prisoner Stoltz
- Michael Masters - Gate Guard
- Barry Atwater - Premier Leon Vados
- Barry Atwater - Gen. Marin
- Barry Atwater - Dr. Carlos Enero
- Arland Schubert - Willoughby
- Arthur Peterson - Helm
- Ernesto Macias - Constantine
- Ernesto Macias - Man at Party
- Scott Walker - Chief Security Guard
- Paul Sorensen - Tower Guard
- Paul Sorensen - First Floor Guard
- Arline Anderson - Receptionist
- Arline Anderson - Secretary
- Arline Anderson - Evie
- Arline Anderson - Nun
- Ed Gilbert - Marceau
- Dick Dial - Bauer
- Bert Holland - Doctor
- Art Lewis - Janitor
- Art Lewis - Cashier
- Ray Baxter - Alexander Ventlos
- Vic Perrin - Cheever
- Vic Perrin - Dr. Ira Drake
- Vic Perrin - Owner
- Vic Perrin - Anton Massik
- Bruce Mars - Sergeant
- Titos Vandis - Gen. Zek
- Sándor Szabó - Ismir Najiid
- Ken Renard - The Assistant Manager
- Ken Renard - Grandfather
- Dick Latessa - Gen. Tamaar
- Davis Roberts - William Barton
- Davis Roberts - Anton Bouchet
- Ann Shoemaker - Madame Prokov
- James McCallion - Sparrow
- Rena Horten - Helga
- Morgan Sterne - Raoul Lenz
- Morgan Sterne - Anton Malek
- Taldo Kenyon - Paulo
- Jerry Riggio - Ortega
- Ray Martel - Security Guard
- Jack Baker - Cabaret Spectator
- Rudy Solari - Zageb
- Rudy Solari - Col. Moya
- Joel Lawrence - Carter
- Joel Lawrence - Wilson
- Thomas A. Geas - Vince
- Thomas A. Geas - Sanchez
- Anne Newman Bacal - Anna Kruger
- Alexandra Hay - Lynn
- Roy Engel - Judge (uncredited)
- Roy Engel - Foreman
- Gary Lockwood - Nicholas Varsi
- Will Kuluva - Premier Miguel Fuego
- Will Kuluva - Edmund Constantine
- Will Kuluva - Rudolf Kurtz
- Lucetta Jenison - Nurse
- Lucetta Jenison - Receptionist
- George O'Hanlon - Captain Douglas
- John Baer - Belden
- Joseph Breen - Danzig
- Joseph Breen - Chauffeur
- Joseph Breen - Vincent
- Elizabeth Ashley - Andrea
- Elizabeth Ashley - Lois Stoner
- Gil Perkins - Russian Colonel
- Michael Stefani - Jailhouse Guard
- Stanley Kamel - Martyn
- Paul Mantee - Byron Miller
- Paul Mantee - Bill Fisher
- Virginia Gregg - Smitty
- Ken Scott - Krone
- Renny Roker - Joe
- Lauren Gilbert - Dr. Adams
- Fred Krone - Killer (uncredited)
- Ronald Long - Sir Malcolm Forrester
- Paul Marin - Clerk
- Rodolfo Hoyos Jr. - Mayor Esbarto
- David Sachs - Pedro Sanchez
- Ann Morell - Louisa
- Dal Jenkins - Rousek
- Dal Jenkins - Razoff
- Steve London - Somers
- William Bryant - Nicholson
- Ben Wright - Dr. Irving Berman
- John Rose - Prisoner
- John Rose - Upstairs Officer
- Alice Reinheart - Nurse Larkin
- Richard Karie - Bellboy
- Richard Karie - Man
- Richard Anders - Lieutenant
- Russ Conway - Dr. David Walters
- Russ Conway - Harry Kellem
- Anne Francis - Gillian Colbee
- George Fisher - Major Strat
- George Fisher - Lieutenant
- Robert Ritchie - Erickson
- Michele Carey - Lisa
- Henry Brandon - Farid
- Elizabeth Perry - Nurse
- Josh Adams - Tour Officer
- Josh Adams - House Guard
- Josh Adams - Reception Guard
- Wesley Lau - Dr. Thorgen
- Wesley Lau - Karl Maur
- William Hansen - Dr. Wimmel
- Michael T. Mikler - Lt. Reigler
- John Aniston - IMF Captain
- Art Koulias - Doctor
- Khigh Dhiegh - General Wo
- Khigh Dhiegh - Toshio Masaki
- Tony Giorgio - Foyer Guard
- Tony Giorgio - Dealer
- Tony Giorgio - Croupier
- Tony Giorgio - Meerghan
- Mario Machado - Technician
- Erik Holland - Lieutenant
- Erik Holland - Rostov
- Erik Holland - Announcer
- Bob Bralver - Foreman
- Jason Wingreen - Official
- Jason Wingreen - Hawn
- Gerald Hiken - Farrell
- Gerald Hiken - Thomas Galvin
- Lisabeth Hush - Alena Ober
- Tony Van Bridge - Erhard Poltzin
- Bruce Kirby - TV Newsman
- Jerry Spicer - Black
- Laurence Haddon - Lieutenant Marlov
- Laurence Haddon - Lee Sheels
- Marcel Hillaire - Bishop
- Joseph Reale - Prince Stephan
- Than Wyenn - Dr. Wessell
- Than Wyenn - General Skolpin
- Bart La Rue - General Kirsch
- Bart La Rue - Lt. Reikman
- Bart La Rue - Guard
- William Visteen - Maintenance Room Officer
- Robert Carricart - Erdos
- John Rayner - Capt. Luis Serra
- Jeff Pomerantz - Stefan Zara
- Gene Tyburn - Sergeant
- Gene Tyburn - Technician Tirkin
- Ben Astar - Deputy Premier Bartzin
- Jack Bernardi - Guard
- Leland Murray - Rafik
- MaKee K. Blaisdell - Guard
- Byron Mabe - Carey
- Byron Mabe - First Officer
- Karen Carlson - Doris Gordon
- John Dennis - Duke
- Percy Helton - Dailey
- Kurt Grayson - Security Guard
- Kurt Grayson - Guard
- Jimmy Bracken - Bobby
- Charles Macaulay - Conway
- Peter Ashton - Blake
- William Beckley - Diceman
- George P. Wilbur - Chauffeur
- Patti Newby - Bergman's Secretary
- Karl Bruck - Defense Minister
- Felice Orlandi - Colonel Alex Strabo
- Micil Murphy - NSF Man
- John Blower - NSF Man
- Victor Paul - Chauffeur
- Victor Paul - Jack Ashbough
- Conrad Bachmann - NSF Man
- Jan Merlin - Leon
- Jan Merlin - Captain Danko
- Luanne Roberts - Louisa
- Trish Mahoney - Maria
- Natividad Vacío - Flower Man
- Alan Bergmann - Colonel Antoine Benet
- Dick Poston - Cook
- Lynn Kellogg - Roxy
- Ron Feinberg - Colonel Kurt Eckert
- Ron Feinberg - Jenab
- Noel De Souza - Behram
- Noel De Souza - Player
- Ed Bakey - Dr. Kadar
- Carole Carle - Flo
- Byron Morrow - Alfred E. Chambers
- Helen Spring - Old Lady
- Victoria Hale - Maid
- Tommy J. Huff - Bellhop
- Jose De Vega - Freddy
- Kasey Rogers - Bunny Cameron
- Don Eitner - Rafik
- Don Eitner - Zucker
- Joy Bang - Girl
- Victor Brandt - Doctor
- Shirley Washington - Stewardess
- Ron Henriquez - Airport Guard
- Bill Baldwin - Announcer
- Ken Swofford - Florian Vaclav
- Ken Swofford - Deputy Mayor Charles Peck
- Chris Holter - Inga
- Walt Davis - Attendant
- Edward Bach - Guard
- Lisa Lu - Mioshi Kellem
- Fuji - Osaki
- Joshua Bryant - Stefan
- Arthur Malet - Undertaker
- Buck Holland - Security Guard
- Buck Holland - Guard
- Rosanna Huffman - Guide
- Lisa Pera - Clara Schram
- Bert Kramer - Rauch
- Biff Manard - Lieutenant Seelik
- Al Roberts - Drunk
- Kelly Thordsen - Captain Dave Abbot
- Charles Wood - Pod Hamp
- Marc Hannibal - Larry Collier
- David S. Cass Sr. - Pinari
- Tom McDonough - College Guard
- Tom McDonough - William Cabot
- Burt Nodella - Gen. Bloch
- Susan Odin - Grace
- Tamara Elliot - Monica Anderson
- Dick Ziker - Finley
- Don Edwards - Policeman
- Johnny Bench - Captain of the Guards
- John Cardoza - Man
- Rex Holman - Captain Maxfield
- Frank Farmer - Howard Bainbridge
- Robert Sampson - Fitzgerald
- Athena Lorde - Mme. Mishenko
- Albert Szabo - Kovitch
- Jo Morrow - Nicole Dubois
- Ken Drake - Minister of Defence Karel Sartori
- Carmelo Manto - Manager
- Riza Royce - Player
- Ed Asner - George Simpson
- Paul Bryar - David St. James
- William Woodfield
- Joseph Gantman
- Robert H. Justman
- Barry Crane
- Bruce Geller
- Allan Balter
- Lalo Schifrin
Ricardo Montalban interpreta a Gerard Sefra en la serie.
Mark Lenard hace el papel de Col. Luis Cardoza.
George Sanders interpreta a Armand Anderssarian en la serie.
Brock Peters hace el papel de Walter DuBruis.
Martin Landau hace el papel de Rollin Hand / General Rio Dominguez.
Robert Ellenstein interpreta a Dr. M. Vazan en la serie.
Nehemiah Persoff interpreta a Prince Iben Kostas en la serie.
Lloyd Bridges interpreta a Anastas Poltroni aka Ted Carson en la serie.
Joe Morton interpreta a Clerk en la serie.
Leonard Stone interpreta a Dimitri Soska en la serie.
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