- Coleen Gray - Sylvia Trager
- Paul Winfield - Barada
- John Marley - Frank Chaney
- Nehemiah Persoff - Ambassador
- Arthur O'Connell - Charlie Sherwin
- Edward Everett Horton - Philip Armistead
- Vernon Dobtcheff - Dedushko
- David Carradine - Jason Blake
- Stanley Adams - Mr. Stephens
- Julie Harris - Verna Ward
- Sal Mineo - Sheldon
- Gene Barry - Glenn Howard
- William Shatner - Peter
- JoAnna Cameron - Carole Crown
- Peter Falk - Lewis Corbett
- 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
- Ricardo Montalban - Bernard Torres
- Martha Hyer - Billie Ramsey
- 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
- Andrew Prine - Jigger
- Jeff Morrow - Dr. Wallace
- Nancy Ames - Louise Hahn
- Don Stroud - Lincoln Bridges
- Ivan Dixon - Conway Walker
- Jason Wingreen - District Attorney Hammond
- Steve Ihnat - Ralph Hoak
- Vera Miles - Marisa Cummings
- Larry Storch - James Kelso
- Paul Fix - Old Bob
- Dane Clark - Bill Oliver
- Tisha Sterling - Niobe Redsmith
- Jack Carter - Bill Crail
- Stephen McNally - Ed Brock
- Estelle Winwood - Henrietta Tate
- Whit Bissell - Donald Merrick
- Sidney Blackmer - Roman Stepanak
- Anne Baxter - Betty-Jean Currier
- Jay C. Flippen - Grover
- Van Johnson - Sullivan
- James McEachin - Jackson
- Sharon Farrell - Jesse Boone
- William Windom - D.W.
- Ed Asner - Vince Leonard
- Jack Kelly - Frank Fowler
- Peter Mark Richman - Robert Coates
- David Opatoshu - Arthur Serokin
- Broderick Crawford - Harry Ricco
- Steve Forrest - A.J. Ward
- Anne Francis - Carol Sherman
- Roddy McDowall - Early McCorley
- Darren McGavin - Sam Hardy
- Henry Jones - Mr. McKim
- Jessica Walter - Linda Ramsey
- John Kerr - Stuart Clark
- Shelly Novack - Mike Wojcik
- Arch Johnson - Sergeant Cook
- Barry Sullivan - Creston Collins
- Clu Gulager - Steve Heywood
- David Sheiner - Lieutenant Martinez
- Keenan Wynn - Ed Wallaby
- Bernie Hamilton - Jason
- Carla Borelli - Holly
- George Murdock - Dave
- Cliff Potts - Andy Hill
- Percy Rodriguez - Reston
- Pernell Roberts - Hank
- Ben Murphy - Joe Sample
- Anthony Franciosa - Jeff Dillon
- Mark Miller - Ross Craig
- Matt Clark - Frankie
- Susan Saint James - Peggy Maxwell
- Anna Navarro - Amelia
- Len Wayland - Priest
- Norm Crosby - Norm Crosby
- Brenda Scott - Suzie Murdock
- Redd Foxx - Redd Foxx
- Robert Culp - Paul Tyler
- Richard Kiley - Dr. Judson Strode
- Ray Ballard - Photographer
- 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 interpreta a Frank Chaney en la serie.
Nehemiah Persoff hace el papel de Ambassador.
Arthur O'Connell interpreta a Charlie Sherwin en la serie.
Edward Everett Horton hace el papel de Philip Armistead.
Vernon Dobtcheff interpreta a Dedushko en la serie.
David Carradine hace el papel de Jason Blake.
Stanley Adams hace el papel de Mr. Stephens.
Julie Harris interpreta a Verna Ward en la serie.
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